Seiko 6105-8000 with 7 digit serial number - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 10-11-2019, 12:47 AM   #1 (permalink)
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Default Seiko 6105-8000 with 7 digit serial number

So this turned up on the ebay. Wrong case obviously but I couldn't help notice this proof 8000 caseback has 7 digit serial number. Never seen this before.
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Old 10-11-2019, 01:11 AM   #2 (permalink)
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6105-8000 April 1968. 7 Didget Close to yours by a few Months Nice when they Pop up. Russell
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Old 10-11-2019, 03:34 AM   #3 (permalink)
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Looks to me like Seiko accidentally produced a batch of case backs with the wrong serials. The 8 at the start is clearly an after addition compared to the rest of the serial no. Pretty cool though.
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Old 10-11-2019, 04:19 AM   #4 (permalink)
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Quote:
Originally Posted by uncleluck View Post
Looks to me like Seiko accidentally produced a batch of case backs with the wrong serials. The 8 at the start is clearly an after addition compared to the rest of the serial no. Pretty cool though.
But then the other 7 digits are off centre.

Then again perhaps the other digits where accidentally stamped off centre so Seiko thought how can we make this look better....ahhhh yes, lets put a wonky digit in the gap. But they should have used the same digit as the first 7 digit. Are you all still with me on this.

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Old 10-11-2019, 04:27 AM   #5 (permalink)
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Seven digit serial numbers where common on the 6105 and other models in the 1960s.
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Old 10-11-2019, 09:16 AM   #6 (permalink)
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My first impression: looks like a fake. What's that other stuff on the back, anyway?
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Old 10-11-2019, 09:45 AM   #7 (permalink)
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My first impression: looks like a fake. What's that other stuff on the back, anyway?
Someone's initials.
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Old 10-11-2019, 09:52 AM   #8 (permalink)
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Here's a couple of my 6105-8000's with 7 digit serial numbers:



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Old 10-11-2019, 10:27 AM   #9 (permalink)
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Jim, That Case Back Is Fantastic

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Old 10-11-2019, 10:41 AM   #10 (permalink)
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I have a couple of other models with 7 digits from the 60's as well. We know the 1st 2 digits should be the year and month, the remaining is the number in the production line. Maybe they made more than 10,000 of those models those years? They would need to add a digit if more than 10,000 were made to avoid a repeat in the serial number.
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Old 10-11-2019, 11:26 AM   #11 (permalink)
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Quote:
Originally Posted by DAHASCO View Post
Jim, That Case Back Is Fantastic

Needs wearing.
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Old 10-11-2019, 11:39 AM   #12 (permalink)
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Quote:
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Needs wearing.
Upside Down
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Old 10-11-2019, 11:44 AM   #13 (permalink)
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Quote:
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Needs wearing.
Yea really...
(it's never had a strap on it!)
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