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Finishing up the 8/0 Lord Elgins, this one, with a 688. The 688 was the Shockmaster version of the 680, with Incabloc shockproofing on the balance. Elgin started incorporating shockproofing on some 8/0 models late in 1950, with the 641, 642, and 647, but it wasn't until about 1954 that they finally made Lord Elgins with shockproofing, the 688 and the 675.

 

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Lord Elgin Clubman. Just wanted to express how much I like this watch. The 680 manual movement is a gem I've purposefully get it wound for about a week now and it is only off a minute in that time. It winds smoothly and easily (say, compared to the 760 movement) and it just feels solid.

Genejockey, love your collection and history. Can you educate me a bit further. I'm not sure I fully comprehend what is meant by 8/0, etc. I've read the definition/description of how this corresponds to size, but I'm not sure I fully grasp it.



 

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Genejockey, love your collection and history. Can you educate me a bit further. I'm not sure I fully comprehend what is meant by 8/0, etc. I've read the definition/description of how this corresponds to size, but I'm not sure I fully grasp it.
It's size, of course, particularly the width of the pillar plate. "The SIZE as a unit has its basis in the old "0" size movement. This movement measures 1 5/30". A difference of 1/30" accounts for each size smaller or larger than the starting point of the system, the "0" size watch movement."

For round movements, it's the diameter. For non-round, it's the width. I presume the standard is to measure across from 9:00 to 3:00.

In men's wristwatches, Elgin made a number of different sizes - 3/0, 6/0, 10/0 - all round; and the rectangular 18/0. After 1935, they standardized. All the round, manual-wind wrist watch movements were 8/0 sized, or 28/30" in diameter.

In 1938, they introduced the tonneau-shaped 15/0, 21/30" wide from 9:00 to 3:00.

They made movements in just those two sizes (not counting the Bumper Automatics) until 1956, when they introduced the 13/0 movements, an oval shape just slightly wider than the 15/0s at 23/30", and with a length equal to the diameter of the 8/0s.

The Bumpers were, IIRC, 5/0, or 1 1/30" in diameter, and the Durabalance Automatics were 6/0, or 1".

So, when I talk about the "8/0 series", it's all the round, 8/0 sized movements from 1935 till 1956:

519(15j); 524(17j); 526(7j); 531(21j); 532(15 or 16j, sweep second); 539 (15 or16j, sweep second, hack setting)

554(15 or 17j); 555(17j); 556(21j); 580(7j)

641(17j Shockmaster); 642 (15 or 17j Shockmaster); 647(17j Shockmaster, sweep seconds)

680(21j); 681(19j); 682(17j); 683(17j); 685(18j Shockmaster, sweep seconds); 687(17j Shockmaster); 688(21j Shockmaster)
 

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It's actually 0-sized. What Stan's referring to is the red '12' on the dial. That is something a number of watches back then had. Stan can elaborate, since all I know, I just wrote :wink:.
 

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Yes, this Elgin Octagon RED 12 is a size 0s, the case measures 31.5mm without the crown.


BUT, behemoth size 12s trench watches do exist.

I know of only two companies that made size 12s cases, the Illinois Watch Case Company and the Philadelphia Watch Case Company.

These are TRUE size 12s wrist watches cases.

99.9% of the size 12s wrist watches that you see on the bay are altered pocket watch cases, NOT true trench watches.

Here is a picture of a size 12s Crown Trench Watch with a Semi-Hermetic Philadelphia 10k gold filled case.

The Crown Watch Company was owned by the Keystone Watch Case Company who also owed the Philadelphia Watch Case Company.

This watch is off the charts rare ! ! !

Only a couple of these are still known to exist, and this one is in PERFECT working order.

It measures 53mm lug to lug, 47mm without the crown with a 16mm lug diameter.







This Crown 12s (with a RED 12) was an Aviator's Watch, I blew this advert up and to my amazement it reads "CROWN" on the dial ! ! !



 

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Here is a size chart to go by.

From left to right:

Size 3/0s: 36mm x 31.4mm x 16mm

Size 0s: 37mm x 32.6mm x 16mm

Size 6s: 42mm x 38mm x 16mm

Size 12s: 53mm x 47mm x 16mm




All of the above pictured watch cases were made by one of the Keystone family of companies, that is why they all share the same lug design.
 

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Lord Elgin Gregory. This is one I got last week on Ebay for $11. Seller said it needed restaffing. Nuh-uh! Just cleaning and a new mainspring (not broke, but really set after sitting who knows how long fully wound)



Came out in 1951.

 
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