'Japan A' vs. 'Japan J' on King Seiko - Seiko & Citizen Watch Forum – Japanese Watch Reviews, Discussion & Trading
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Old 11-26-2016, 05:41 PM   #1 (permalink)
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Default 'Japan A' vs. 'Japan J' on King Seiko

I've seen King Seiko case backs indicating 'Japan A' and others indicating 'Japan J'.

I can't find a reason for this. I've seen both in automatics, hand winders and quartz models. Chronometer certified and non-chronometers. I've seen it on case backs with and without gold-medallion. I've seen that the logo's in the dials are equal in both cases.

Could anyone enlighten me what the difference of 'Japan A' vs. 'Japan J' could be? Could it be that the watches came from different factories, i.e. Suwa and Daini? Or didn't come the same King Seiko models from both factories?

I tried to include some clarifying pictures with this post, however miserably failed :-(

Thanks and best regards,

Gerard
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Old 11-27-2016, 12:20 AM   #2 (permalink)
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Do you have example case reference of either instance? Do both letters occur for the same case reference within the same production year? My first thought is that the "A" and "J" are internal casing codes to let service personnel know what procedures to use for dismantling/assembling the case. Check on page 13 here for an example of some of these different codes ("J" isn't listed so I can't be 100% certain).
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Old 11-27-2016, 07:36 AM   #3 (permalink)
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Thanks @rileynp I'll try to get some pictures online..
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Old 11-27-2016, 07:47 AM   #4 (permalink)
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Old 11-27-2016, 07:47 AM   #5 (permalink)
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Bingo! ;-)
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Old 11-27-2016, 04:40 PM   #6 (permalink)
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Hmm, I'm stumped! "A" as I know it should refer to the movement being removed from the case back and the glass being pressed out from the inside, but your one-piece case there would clearly say the "A" in that instance refers to something else!
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Old 11-27-2016, 11:08 PM   #7 (permalink)
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Here is my King Seiko 4502-8010 screw-on case back "Japan A" for reference.
Attached Images
File Type: jpg 2016-11-27 22.14.30.jpg (158.1 KB, 25 views)

Last edited by Grammarofdesign; 11-27-2016 at 11:15 PM.
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Old 11-28-2016, 04:33 AM   #8 (permalink)
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Don Crotty give more or less the same explanation in a Facebook group. (As a junior member I can't post links yet)

It's indicating how to remove the glass. 'A' would suggest pushing from the inside, however that's not possible with a monoblock casing indeed...

Last edited by GerardNijenbrinks; 11-28-2016 at 05:55 AM.
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Old 12-30-2016, 02:19 PM   #9 (permalink)
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Is there a difference valuewise?
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