Seiko 7A38 - by the numbers


Useful Seiko links:

Seiko Oceania database (Catalogue search)

Seiko 7A38 Case Parts Search on

Jules Borel Case Parts Search (old website): (enter as 7Axx-xxxx)


Seiko Parts Catalogues and Technical Guides (.pdf format)






Seiko User Instruction Manuals

7A38 Seiko 7A38 User Instruction Manual (original scan courtesy of Roland Kamp / SCWF)


Recommended Reading:

7Axx Rate adjustment threads on other forums: 

1) On the old Network54 SCWF, started by 'Charles', with further contributions from Hung Pham 'Time2Fly' and Michael Rothe:

2) By David Johnson (a.k.a. DWJQuest) on WUS:

3) By retired Seiko designer Ikuo Tokunaga on SCWF:,277.msg408.html#msg408


OldeCrow's 7Axx crystal replacement tutorial:

Steve Gurevitz's excellent article on 7A28s:


Worldwide supplier list:

Sources of Horological Tools & Parts: (courtesy of NAWCC)


Watch Strap suppliers of note:

Henrik de Keiser:

Stella / Tungchoy:

UK Watch Strap (TMC Ltd.):


TSS Watchworx (Ken Danks):


Sternkreuz catalogue download:

G-S Supplies catalogue download: http://www.gssupplies.getcatalog-online.php (Mineral Glass sizes on page 118).

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