Seiko Case Materials Codes

Seiko Case Materials Codes

Postby koimaster » November 2nd 2016, 11:46am

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Some additional explanation of the above scan from "Sweephand":

...here's a scan of the very last page of the Seiko 1972 Watch Parts Interchangeability List which refers to those calibres with no movement #. In the intro to the list, it says that it is to be used in conjunction with the Seiko Parts Catalogue, so the numbers in the furthest right column refer to that - I don't have a copy of that though. It also says that this interchangeability list from 1972 'combines calibres listed in the Parts List for 1968 and new calibres placed on sale thereafter'.

The {above} scan is Part 2 of the Calibre & Parts Index - Part 1 lists by calibre number and it's clear from that, that the parts catalogue is structured in a straightforward way, for example:

Calibre #/Parts Catalogue #:
6206A / 62-06-1
6206B (17j) / 62-06-4
6206B (26j) / 62-06-3
6218A / 62-18-1
6218B / 62-18-2
6218C / 62-18-2

As you can see, it's only the last number which is not apparently logical without sight of the Parts Catalogue - may simply be the subsection / page # in the catalogue.

The are some variation to this where the older movement # is used, but you can see where it fits with the revised 4 digit movement numbers, as in this example:

Calibre #:/ Parts Catalogue #:
400 (33j) / 62-06-2
44A (25j) / 44-00-2
395 (39j) / 62-19-1

Finally, there is the odd 4 digit calibre # which doesn't follow the usual structure, but clearly links it to the relevant parts e.g.

Calibre #: / Parts Catalogue #:
3140 / 62-00-1
4361 / 66-00-2

With reference to the 54A calibre, this is in the index, but is in parenthesis () and has no parts catalogue #.

So, from this evidence, you can see, for example, that the Goldfeather listed in Part 2 of the index - the scanned page - has the 6000 movement, and as 60-00-2 in the Parts Catalogue, whilst its 17j variant is listed in Part 1 as a 60M calibre, and as 60-00-1 in the parts catalogue.

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ADDITIONAL SPECIFICATION OF UN-NUMBERED CALIBRES

Another collector [John White] had the following to say about Un-numbered Calibres:

I was looking thru an old Seiko parts interchange manual today and noticed an interesting section in the very back titled "Conventional Parts of Men's Watches Without Cal. No." The watches (listed by MODEL name) in this section are: Cronos 17J, Cronos 21J, Cronos 23J Cronos Self Dater, Champion 17J, Champion 19J, Champion Calendar 19J, King Seiko 25J, King Seiko w/Second-setting, Lord Marvel 23J, Laurel 17J and Goldfeather.

Then follows a tabular matrix listing numbers for each part for each of the above watches. The striking thing is that (from a fairly detailed study of each page) all of these models used essentially the same parts. This fits in with your finding regarding the genesis' of the first KS and maybe adds a few more members to the 'Royal family tree'. The other thing, of course, is that it affirms that the movements in these models did not carry a discrete caliber number.

Cronos 17J 54-00-2
Cronos 21J 54-00-2
Cronos 23J 54-00-2
Cronos Self Dater 54-02-1
Champion 17J 54-20-1
Champion 19J 54-20-1
Champion Calendar 19J 54-22-1
King Seiko 25J 54-40-1
King Seiko w/Second-setting 44-00-1
Lord Marvel 23J 55-00-1
Laurel 17J 55-20-1
Goldfeather 60-00-2
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