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Sourced from numerous places on the Internet, particularly the Seiko/Citizen forum, but not necessarily a complete & definitive list;

- Actus: (Sub-brand) -Lower end Japan market Seikos produced in the late 1960's thru the 1970's that were comprised of both Seiko 5 Actus and regular Actus and with an emphasis on styling. They seem to come in both rather conventional and "mod" case/dial designs, but the "mod" ACTUS not as radical as the typical Advan & VANAC styles. This series used 6106 and 7019 movements (maybe others BUT these two are the most common ones) Date languages were English/Japanese only. The word Actus is a Latin word meaning unit of length, progress/moving through, series/sequence, act, performance (of play), delivery, action, or deed.

- Advan: (Sub-brand) - A specially styled (1960's "mod") versions of 6106, 7019, & 7039 caliber powered watches. This was a mid-range line (while the VANAC line mentioned below was the upper quality line of "mod" styled watches.

- AGS:
(Product Line) - An acronym for "Advanced Generating System" or "Automatic Generating System", which was used on some of the earlier Kinetic powered quartz watches. At their introduction in 1988, Kinetic watches were branded as “Auto Quartz”. In 1989 this was changed to AGS (or the full, Advanced Generating System or Automatic Generating System); and finally, in 1997, the name was replaced by Kinetic.

- Alpinist: (Sub-brand) - a Japan market line of watches first introduced in 1961, which was inspired by the Japanese concept of Yamaotoko. According to Seiya Kobayashi, this term translates into English as “mountain man”, and generally describes the Japanese tradition of amateur mountaineering in which people pass time by to climbing Japan’s mountains during weekends and holidays. To these folks, having dependable climbing gear is important. The Alpinist line consists of five generations, with the first one being first released in 1961 (the hand-winding Laurel Alpinist). This model was followed in 1963 by the Dauphine-hand Champion 850 Alpinist. Seiko then retired the line for 30 years, only to revive it again in 1995 with the popular automatic/hand-winding 4S15 caliber models, which was only in production for two years. Due to the popularity of that model, in 2003 Seiko released a titanium-cased, Perpetual Calendar Quartz Alpinist with red GMT hand, and in new 2006 a stainless steel automatic/mechanical Alpinist powered by the 6r15 caliber which closely resembles the 1995 model.

- Arctura: (Sub-brand) - Midrange new designs for the international market. Debuted in 2003 (I think) with the SNL001P Kinetic chrono with the 7L22 movement. Largely a dressy affair with a hint of sportiness. The Kinetic Auto Relay models (5J32) appeared shortly with the latest 7D46 Perpetual Calendar appearing in 2006 or so.

- Astron; Seiko Astron, which spawned a new genre of GPS solar watches, celebrated the fifth anniversary of its debut in 2017. During these five years, Seiko Astron has evolved dramatically by becoming even smaller with a mechanism that consumes even less power. This watch is earning high acclaim as an essential business item of globalists who are active throughout the world and it has led the market as a top brand of GPS watches. In marking the watch's fifth anniversary, Seiko launched an executive line of watches with improved design and exterior specifications targeted at global business persons who aim for the top globally. With an extensive lineup arranged according to functions such as chronograph and dual time functions, Seiko Astron stimulates the sensitivities of people taking on challenges on the world stage. Based on the slogan, "further evolution," Seiko Astron will continue to advance in the future.

- Bell-Matic:
(Sub-brand) - A family of automatic watches characterized by having a mechanical alarm that can be set by an internal rotating bezel and activated/deactivated by a pusher located near the 2:00 position of the case. They were available in a wide range of styles and models during the late 60’s and 70’s and featured some of the largest non-diver cases produced by Seiko at that time. They are predominantly powered by a variant of the 4xxx caliber of movements (please expand on this).

- Business:
(Sub-brand) - ( aka Bell-matic and Business A) The Business brand was used on a few Japanese market Bellmatics during the late 1960s, which were powered by the 4006 Bellmatic caliber (Business Bell) and the 27j 8306/46 Seikomatic caliber. This sub-brand seems to have been part of a short marketing campaign intended to emphasize the attractiveness of Seiko watches to the Japanese “salary-man”.

- Champion: (Sub-brand) - The Champion was Seiko's low end hand-wind watch introduced in 1960 in 17 and 19j versions. The Champion evolved with the Champion Calendar (1962), the Champion 850 (1963) and the date version Champion 860 (1964). The Champion also existed in a few specialized versions, of which the Champion Alpinist is the most famous.

- Coutura: (Sub-brand) - North American market dress/sports dress watches. Not available in SE Asia.

- Credor: (Brand) - See "Seiko Credor" entry below.

- Cronos: (Sub-brand) - Daini designed and manufactured high-end manual watches produced from 1958 to 1964 in 17, 21 and 23j versions. Also available as Cronos Self-dater (with date) from 1961 and Cronos Special (with extra adjustment) from 1963. The Cronos was Seiko's mainstream offering in the late 50s, similar to the Marvel. The Cronos line were generally precursors to King Seiko and Grand Seiko and not quite as high-end. A refinement of the Cronos movement was later used in the King Seiko.

- Crown: (Sub-brand) - Suwa designed and manufactured high-end manual watches of the late 50’s and early 60s. They were precursors to the Grand Seiko and not quite as high-end. The logo looks something like the Rolex logo and in some instances, was used in conjunction with other sub-brand names, such as in a 6218 Seikomatic Weekdater & a 6216. These are both highly jeweled (35j & 39j) movements with a quality level only slightly below that of their contemporary Grand Seikos & associated Chronometers.

- DX: (Sub-brand) - A line of inexpensive Seiko Automatics consisting predominantly (but not exclusively) of caliber 6106 (a, b & c) & 70xx caliber powered automatics, produced during the 1960's thru the early 80’s. These watches were produced during a time in which Seiko experimented widely with design. DX is an acronym for the word Deluxe and it was originally supposed to reflect the supposed general luxury character of the watches. In reality, they were generally affordable and tended to offer design touches typically found in more expensive watches of the time, such as iridescent or textured dials, applied markers, and/or painted hands and markers. Styling ranged the gamut from conservative to pretty far out. Some DX models were also offered in a regular line (such as Seiko 5) and aside from the DX markings are indistinguishable from the regular model. In at least on case that I know of, the watch evolved over time keeping the same case but changing the movement (and jewel count). By the time the DX designation was used in its later days, it doesn’t seem to have really meant much any more.

- Goldfeather: (Sub-brand) - A short-lived line contemporary with the first KS (1950’s) that was slimmer and not quite as high end as latter Grand Seiko’s. However, there is one anomalous model in that line - the 609000. Instead of being the "classic" ultra-slim (for it's day) uncomplicated (in the styling sense, not mechanical sense) dress watch, this one is rather "chunky"/solid and has "mod"/fashion influences, but not to the extent that most VANAC/AdVan models do.

- Grand Seiko (GS): (Brand) - Since 1960, it has been Seiko’s highest end line of chronometer grade mechanical watches. In many ways comparable or superior to the best mechanical watches produced in Europe. All are manufactured in Japan and are predominantly available only to the Japanese market (though some have said that some models have been made available in Hong Kong) be prepared to spend serious money for one.

- Gyro Marvel: (Sub-brand) - The Gyro Marvel was Seiko’s first independently developed automatic watch. It was introduced in 1959, as a subset of the Marvel Line. The Gyro Marvel’s caliber is based on the Marvel caliber and exist only in a 17j version. Like the Marvel, they formed Seiko's top watch line of watches during the late 1950’s. Sadly, the Gyro Marvel was relatively short lived and was replaced in Seiko’s lineup by the Seikomatic in 1960.

- Kinetic: (Product Line) A line of mid priced quartz watches produced from the mid 1990’s until the present, that covered many different watch types and style. They were characterized by getting power from a rotor used to generate an electric charge which is stored in a rechargeable medium. Originally these were capacitors, but do to problems, capacitors were later replaced by rechargeable lithium ion batteries .

- KS (King Seiko): (Sub-brand) - A high grade watch that was second to the GS as the most top of the line Seiko during the 1960’s and 70’s. Some of the models featured an unique external adjusting screw so that if it was fast or slow the movement could be adjusted with out removing the movement from the case (was one piece case in the beginning). Later versions of the KS were in the Vanes line which was a funky mode line of the 1970’s

- LASSALE: (Brand) - Jean Lassale was a Swiss watchmaker who made his mark by creating a line of ultra thin dress watches in the 1970's. Seiko bought the brand and proceeded to make very similar ultra thin dress watches from 1981 and to the early 90's, mainly for sale in north America. Seiko's LASSALE branded watches were quartz powered though, but they were all relatively high end. AFAIK after Seiko folded the brand it has not reintroduced it, but I could be wrong. As I understand it (and please correct me if I'm wrong) the brand "Jean Lassale" (not LASSALE) has been reintroduced on ultra thin swiss made mechanical watches and are unrelated to Seiko. According to Seiko corporate history, Seiko "acquired Jean Lassale, a Swiss subsidiary, and developed a product that combined Seiko's quartz movements with a very thin Swiss-style case. By seeking higher profit margins from luxury products, the company expected to make up for declining profit margins on its less expensive products. The Jean Lassale purchase was part of a pricing strategy to offer a more expensive line to complement lower- and medium-priced watches and appeal to a wider range of customers."

- LM (LordMatic): (Sub-brand) - was a mid range Seiko that boasted the fact that the watch was an automatic that was thinner then all other auto’s of the time. In the beginning the watches were one piece design that you could only remove the movement from the front. Had the 5606 movement that was the base for the KS’s of the time. There is also Lord Marvel, LordMatic Special. The LordMatic was made by Suwa, while the LordMatic Special was made by Daini (using completely different movements with higher quality/accuracy specs).

- LM Special / LordMatic Special: (Sub-brand) - A subset/evolution of the LM line. They were powered either by 5206 or 5216 auto movements, in 23j or 25j variants running 28.8K bph (base LM’s were powered by 21.6K bph automatic movements in 23 or 25 jewel variants.

- Lord Marvel: (Sub-brand) - A subset/evolution of the LM line. These models were hand wound with and powered by one of the 5740 caliber variants. The 5740C is the hi-beat 36,000 BPS version and is said to have been the "trial" effort for later hi-beat Grand Seiko calibers (such as 61xx series). Once Seiko knew the 5740C was a technical success, they were able to market the hi-beat 36K GS line.

- Marvel: (Sub-brand) - The Marvel was a Suwa watch introduced on June 10, 1956, a day that coincidentally was also "Time Memorial Day", a one day celebration of time all over Japan. The Marvel was the first modern caliber produced by Seiko and a large leap forward both for technical achievement and manufacturing efficiency. This sub-brand was Seiko's top watch line of manual-wind watches during the late 1950’s. They were made in 17j, 19j and 21j hand-wind versions and remained in production until 1959.

- Navigator Timer: (Product Line) A Family of watches that included an additional hand that could be set against a 24 hour GMT scale so that time could be read simultaneously in another time zone. I'm not sure if these came only in vintage automatics or if the brand has survived into quartz or other types of movements. Seiko has for sure continued to use the concept both in modern quartz, automatic and spring drive powered watches.

- Premier: (Sub-brand) - Seiko's mid range international line of automatic, quartz and Kinetic dress watches. According to Seiko: “The Seiko Premier collection combines classically refined inspiration with subtly modern expression. Inspired by the eternal beauty of neo-classical architecture, each Premier case has the solidity and grace of a Palladian villa and each dial has a depth of sculpted detailing that draws its inspiration from the architraves of a Greek temple. However, these classical features are also expressed with a modern flair. Premier is classical yet modern, reverential yet bold, restrained yet eye-catching”.

- Presage; -The Seiko Presage is an ideal dress automatic watch collection which consists of gorgeous dress watches in various style and colors. Some of the Seiko Presage watch line comes with the complications such as power reserve indicator, chronograph, and retrograde indicator. Thus with brilliant styling and build quality, the Seiko chronograph Presage watches are perfect to fit in the luxury collection. Seiko Presage adopts TRIMATIC, a collective term for three independently developed technologies to ensure that mechanical watches are easy to use on a daily basis, provide stable precision and can be used over long periods. Seiko Presage utilizes the Diashock anti-shock structure, the Magic Lever that enhances winding efficiency and improves maintenance characteristics and Seiko's proprietary alloy named "Spron" that realizes improved performance of the spring that delivers precision and durability. In addition, Seiko Presage's mechanical-like design and case are also attractive features. The classical enamel and lacquer dial were finished off by representative masters. With the Presage line that pursues Japanese technologies and traditions and proposes new value positioned at the apex, in 2016 we began making this line of watches available globally as mechanical watches that combine practicality and elegance, and these watches are earning high acclaim.

- Presmatic: (Sub-brand) - cal. 5106 & 5146 high quality automatics. The Date quickset is activated by pressing a button in the center of the crown. The 5106 was also built into a model called the "Seikomatic P".

- Prospex: (Sub-brand) - A JDM line of watches composed of models intended for professional activities and sports (eg. dive watches, chronometers, running watches, flight watches, etc.). The name is a play on the words Professional Specifications, or Pro Specs. Several models which in the Japanese market are included in the prospex range are not included in the range when sold in international markets (many Prospex models are JDM models only). Propsex watches don't actually carry the propsx brand on the watches. Instead the brand is included in the packaging, literature and hang tags that come with the watches.

- Pulsar: (Brand) - Originated as a Hamilton Watch Company brand that was known for high-tech red LED watches in the 1970 & 1980's. The brand changed hands several times until 1979 when Seiko acquired the Pulsar name. Pulsar watches are priced between Seiko and Lorus brands and are sold in many countries. Seiko appears to have used Pulsar to test market new concepts. An example would be the short lived PSR 10 which tested the viability of a moderately priced highly accurate timekeeper. Many Pulsar watches use Seiko quartz movements, including the H023 as well as analog chrono movements. Pulsar has also recently expanded to use orient automatic movements in some dress model lines and the seiko 7s26 on their rebranded versions of Alba automatic dive watches.

- Seiko 5: (Sub-brand) - Seiko 5 is Seiko's introductory line of automatic watches. The "5" stands for the watches 5 principal attributes: 1. Diaflex (unbreakable mainspring), 2. Diashock (Seiko's shock resistant design, equivalent to the Swiss "Incabloc"), 3. Automatic winding, 4. day/date indication, and 5. Water Resistance. The 5 logo has been applied to a wide variety of calibers and styles and is one of the few sub-brands still in use today.

- Seiko 5 Sports: (Sub-brand) - Basically the same thing as Seiko 5, but used in watches styled to appeal to people involved in sports, without being manufactured to handle professional use or abusive conditions. Seiko was not necessarily strict about this and there are numerous examples of identical watches which carried both the Seiko 5 and Seiko 5 Sports brand.

- Seiko Credor: (Sub-brand and Brand) - This brand is two things at different times. During the 1980 & 1990's it was a Sub-brand of high end analog quartz watches. The sub-brand was reinterpreted in the late 1990's and reintroduced as a separate stand alone Brand making very high end mechanical watches similar to Grand Seiko but with less traditional, more experimental (yet still conservative), more youthful styling. The success of the sub-brand, coupled with the introduction of Spring Drive movement caused Seiko to relaunch it once again in the early 2000's as a separate stand-alone brand called Credor. The new Credor brand stands together with Grand Seiko as the top brand for the company, but focuses on much more innovative styling, materials and the use of the Spring Drive movement (they do use mechanical movements, but not as high end as Grand Seiko and there are unconfirmed rumors that mechanical movements might be fazed out of Credor altogether)

- Seikomatic: (Sub-brand) - Seikos first broadly marketed automatic watch line (there had been a limited and very expensive Seiko automatic already in the mid 50s and the Gyro Marvel in the late 50s). They were introduced by Suwa in 1960 with the 603 caliber in 17, 20 and 30j versions. After the 603 caliber, Seikomatic then became the general brand for most Seiko mid range automatic watches below the King Seiko and Grand Seiko and was sold in many variants and with many different calibers until the mid/late 60s.

- Skyliner: (Sub-brand) - A line of Manual watches made in various styles, from classic dress watches to more edgy designs later on, offered during the 1960’s. The Skyliner sub-brand was introduced in 1961 using the 402 caliber. This particular Skyliner is a no-nonsense hand-windable dress watch without date. At the time, the Skyliner sub-brand was positioned as a cheaper alternative to the Liner sub-brand which was in the medium range of Seiko at the time. The Liner sub-brand also had a broader range with both 21j and 23j calibers and 14K gold cases. The 402 caliber is also a simplification and continuation of the Liner 3140 caliber from 1960. The Skyliner brand was also used in the mid 60s on a few 62XX watches with a quite modern design and in the late 60s on dress watches with the 61XX caliber.

Spirit: (model line) - Short-lived mid range Seiko line known for simple, elegant design & durable movements. The 'Blue Spark' was an example of this line. 'Spirit' was replaced by the 'Sarb' line around 2011.

- Sportsman: (Sub-brand) - The Sportsman, introduced in 1960, was Seiko's budget hand windable line, with 7, 15 and 17j versions. It remained in Seikos lineup until the mid 60s with a number of variations and with waterproof and calendar functions. It was also marketed in conjunction with Seahorse and Dolphin branding.

- Sportsmatic: (Sub-brand) - The Sportsmatic auto was introduced in 1961 by Suwa as a cheaper and more sporty alternative to the Seikomatic. As with the Seikomatic, the Sportsmatic was produced during most of the 60s in many variants and with different calibers including diver models, Sportsmatic 5, Sportsmatic Deluxe and Sportsmatic 820 calendar.

- Sportura: (Sub-brand) - Seiko's introduction of their mid-range sports quartz watches also for the international market. Bold styling reflecting a new generation of Seiko watches for those in their thirties was probably the design philosophy. First appeared in 2003 in a variety of movements: H023 (analog digital world timer), 9T82 (Kinetic 1/10sec chrono), 5J32 (Kinetic Auto Relay), 8F56 (GMT Perpetual Calendar) and 7T62 (alarm-chrono). In 2004 the 7L22 Kinetic chrono was introduced with the Tonneau cased, SNL015P. Latest additions included the new retrograde chrono (7T82) and H024 analog digital (non-world timer). The most expensive of the Sportura models is the SLQ-series, 9T82 which is hand assembled in Japan. The SLQ is not a Japan domestic market model, however.

- Spring Drive: (Product Line) - A unique family of hybrid mechanical watch calibers that eliminates the traditional balance wheel/escapement regulating system in favor of a "Tri-synchro Regulator." The power from the main-spring spring is used to drive a microgenerator which generates electricity for powering an ultra-low consumption quartz crystal oscillator, which in turn is used to regulate (with quartz accuracy) the speed of the glide wheels via a magnetic break, to exactly 8 beats per second. Until recently, Spring Drive was sold regularly in Japan within the Grand Seiko and Credor lines. In recent years, Seiko has expanded the use of Spring drive calibers to high end Seiko branded products specifically designed for international markets.

- Seiko Dive Watch -
And for those of you who would like a link to a reference site for Seiko Divers: Seiko Divers Reference

- Seiko Watch Production Dater;
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