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Discussion Starter · #1 ·
Today I picked up this most interesting Weekdater. The outside of the etched Dolphin case back is marked "J13080". Inside the case is engraved "J13080 MAW" Upon opening it reveals a 6206A, 26J movement at 19,800 bph.

To my great surprise, it is 'gold tone' in color. Not sure if that's copper or some thin EP plating. Anyway it's my first gold tone movement since I sold my old Bulova Super Seville years ago.

I found this very informative thread here on SCWF about the 6206A/B movements:

http://www.thewatchsite.com/21-japa...06-caliber-1960s-workhorse-seiko-classic.html

So, can anyone explain why the case back is numbered J13080 and not "6206-8990" (or similar)? The inside is engraved 52XXXXX so it's from Feb. 1965. The thread above suggests that the 6206B came about in Feb 1965 so this makes a lot of sense.

Here are some photos. I'll be in the market for a new dial, this is way too much WABI for me !
 

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Seiko used a different model numbering system prior to the cal followed by case/region format. I don't know if there is any overlap between the two formats.
 

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Special Member
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Discussion Starter · #3 ·
Seiko used a different model numbering system prior to the cal followed by case/region format. I don't know if there is any overlap between the two formats.
Thanks Mike.

I was wondering how to decode the J13080 with respect to casing guide, etc.

The inside engraving shows the 52XXXXX for Feb 1965. The movement is engraved 6206A. The Dial Code is 6206-80XXX where the letters are hard to read due to age and the scratched crystal.

So how would one 'de-code' the J13080 portion?
 

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Craftsman
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There is a slight overlap between the old numbering code and the new one. Older casing books use the old codes, for instance the crystal for that case is a 338W01AN, crown is DJ0060B and stem is 354720. I was told the 13 in the code denotes the movement size in ligne but it never works out to my calculations!
 

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Special Member
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Discussion Starter · #5 ·
There is a slight overlap between the old numbering code and the new one. Older casing books use the old codes, for instance the crystal for that case is a 338W01AN, crown is DJ0060B and stem is 354720. I was told the 13 in the code denotes the movement size in ligne but it never works out to my calculations!
Thank you. Fantastic.
 
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