Hi Adam et al,
I notice that the A904 manual on your website is just the Technical Manual, not the operating instructions. I have the A904 operating instructions in .BMP form. Also, your website lists no manual for the W309, which works identically to the A904, so the A904 operating instructions would be correct for the W309 (& W307 & probably W319). I have compared the operation of the A904 with the W307 & W309 and can’t find any difference (except the W307 has no light). The display is just a little different between the A904 and the W307/W309/W319, but they all operate the same. I have compared the modules in detail and they are physically identical also, except for the display, although the displays all show the same information.

My theory on why Seiko produced these different versions of the same module is as follows: (1) They changed the appearance of the display of the A904 for the W307/W309/W319 to distinguish it from their cheaper versions from Pulsar, Alba, & Lorus. (2) The light-less W307 came about to use up W309 modules where, at the factory, the light tested bad. Note that the W307 module has a switch, just no button to operate it.

I will email the A904 instructions and pix of the Alba W307, Pulsar W309, & Lorus W309 that I have.
-Dwight FitzSimons

Thats great thank you Dwight, much appreciated. I am missing quite a few of the Seiko manuals. I have some to scan but its just getting the time to do anything.
Do you have a ll the A904 variants in your collection?

regards

Adam

Hi Adam,
My goal in life is to collect all the A904 variants. Currently, by my count, I have 29 A904 variants, plus several that are just slight variants (slight color variants on faceplate). There are over 30 A904 variants that I know of, so I am still looking.
-Dwight