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SPECIFICATIONS:

MOVEMENT: SEIKO Quartz Cal 7548, 5 Jewels, 32’768 Hz
CASE: Stainless steel (diameter: 43 mm excl. crown, lug-width: 22 mm), Screw-in case back, Screw-down crown, Bidirectional rotating elapse-time bezel
OEM CRYSTAL: 320W10GN Hardlex
CROWN Ref.# 70W22NS1
WATER RESISTANCE: 150 m (Pressure-tested)
PRODUCTION PERIOD: 1978 thru1985
OEM battery SEIKO SR43SW
universal replacement part number currently is a #386 battery.

OEM GASKETS:

Ref.# OK0240B0A - CROWN Gasket
Ref.# OC3060B0A - CASE BACK Gasket
Ref.# 0C3660B02 - BEZEL Gasket
Ref.# EC3160B04 - CRYSTAL Gasket


SEIKO PYH018 7549-7000 JDM a true 150m diver's watch with quartz accuracy and dependability whose styling legacy is carried on by the SEIKO 7S26 200m SXK007/9 SCUBA DIVER's.

Released 1978, a time where quartz movements were state-of-the-art, the 7548 shares many parts with the mechanical 6309 movement which was used in the Turtle. You can exchange parts between this movements. In fact, the 7548 is a 6309 with a quartz section. It’s a high reliable movement, containing almost no plastic parts, 5 jewels and a trimming screw to adjust the speed. A high end movement in it’s time and until today one of the best quartz movements ever.

There are the typical black and Pepsi versions, an orange version and even an extremely rare green version.

SEIKO Quartz DIVER series

Variants:


7548-7000 Black dial and black bezel - SQ and non-SQ versions
7548-7009 Black dial and black bezel - SQ dial
7548-700A Orange dial and black bezel - SQ dial
7548-700B Dark blue dial and pepsi bezel
7548-700C Orange or (very rare!) Green dial with black lume border and black/gold bezel/hands
7548-700F Dark blue dial and pepsi bezel - SQ dial
7548-700H Orange SQ dial with silver lume border and black bezel - maybe also non-SQ dial

Near end of the production run:
TWO - 200m versions available with screw down crystal retaining ring just like the 7c43-7xxx 200m quartz divers

7548-7010 Black dial and black bezel
7548-701A Orange Dial and black/gold bezel

My 1983 SEIKO PHY018 (7548-7000) JDM


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