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VINTAGE SEIKO 7548 DIVER

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SEIKO 7548-7000 JDM
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SEIKO 7548-700F Dark blue dial and pepsi bezel - SQ dial

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Housed in the same case used on the Seiko 6309-7290 150m Automatic Diver “Slim Turtle” , it uses a Seiko 6309-7040 movement with a Quartz module modification designated as ref.# 7548 A high end movement in it’s time and until today considered as one of the best quartz movements Seiko made [movement also used in the Grand Father TUNA quartz model]. The 7548 divers were produced from 1978 till 1985. Much of the reputation of SEIKO was in part helped by U.S. Military personnel who swore by the Japanese watch brand. Seiko dive watches were popular with US Navy divers, regular grunts, and yes even amongst top brass.
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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:
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7548-7010 Black dial and black bezel 7548-701A Orange Dial and black/gold bezel 1980's SEIKO Quartz DIVER series
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The PYF028 (7549-7010) 300m quartz tuna, orange dialled PYQ019 (6458-600A) and black dialled  PYQ018 (6458-6000) midsize 150m divers, PTJ011 (2625-0010) and PTJ020 (2625-0170) compact 150m divers.  The right hand side of the page features the black PYH018 (7548-7000) and pepsi PYH011 (7548-700B) 150m full size quartz divers. There is also the orange SAD017 (H558-500A) arnie model with a clear shot of the original strap design that has the decompression limits table on it. PARTS LIST:

 CIRCUIT BLOCK BOARD SEIKO 7548A MOVEMENT FIVE JEWELS

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OEM battery SEIKO SR43SW
universal replacement part number currently is a #386 battery.

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70W22NS1 Crown
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OK0240B0A GASKET - CROWN
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OC3060B0A GASKET - CASE BACK
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0C3660B02 GASKET - BEZEL
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EC3160B04 GASKET - CRYSTAL
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320W10GN Crystal also used on 6105,6119, 6306,6309

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(Edited)
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RayF
22218
Feb 25, 2021
Thanks for yet another interesting history lesson!
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