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Production Date Calculator

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This is the only one I`ve come across, from our very own forum no less :rltb:

Dating Seiko & Citizen Watches:

Well it's pretty easy just so long as you know when the Movements were in production... So for example the Seiko SKX007 Powered by a 7S26 Automatic Movement. With a serial number of 1N0596 is easy to date...

Movement 1st made for sale in 1996

The 1st number of the serial number signifies the year which is '1' so that means it is 2001

The 2nd number or letter signifies the Month 'N' which is November

So this watch was produced in November 2001 ;-))

So for a 7S26 Powered Watch.

Seiko Year:

6 - 1996

7 - 1997

8 - 1998

9 - 1999

0 - 2000

1 - 2001

2 - 2002

3 - 2003

4 - 2004

5 - 2005

? - 2006 Oh this year is going to be Fun!!!!!!

Seiko Month:

1 - January

2 - February

3 - March

4 - April

5 - May

6 - June

7 - July

8 - August

9 - September

O - October

N - November

D - December

With Citizen Watches it was thought that the Serial number worked in the same way but it is now thought to differ with the month part.... This was mainly because it was noted that there were apparently a lot of watch serial numbers with the 2nd number of '0/O' pointing to an October manufactured Month... So the current mode of thought is like this...

Citizen Serial Number 81107543

Movt. 1st made for sale in 1967

The 1st number of the serial number is '8' so 1968

The 2nd number is 1 [under the Seiko method we'd think January... However this is now thought to be wrong] it is the 2nd + 3rd number which is 1+1 = 11 so the Month is November

The watch was made in November 1968

Citizen Year:

Same year Method as the Seiko:

Citizen Month:

01 - January

02 - February

03 - March

04 - April

05 - May

06 - June

07 - July

08 - August

09 - September

10 - October

11 - November

12 - December

This method works well with my vintage Citizens...

I hope that it helps...


Edited by mach 0.0013137
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