7-digit Seiko serial number

[Der Amf]

My new 6100-8000 Skyliner has a seven digit Serial Number. It starts 8N0****. Should I conclude this is November 1968? (That would make sense) The movement is a 61A.

[pepperami]

http://www.csce.uark.edu/~jgauch/photos/seiko/

Did you try this mate?

Sent from my GT-I9505

[Der Amf]

http://www.csce.uark.edu/~jgauch/photos/seiko/

Did you try this mate?

Sent from my GT-I9505

Thanks but that one only does six digit numbers, it's what I've used before. I've read somewhere that 7 digit numbers only occurred at the end of the 60s, very early 70s.

[pepperami]

I've seen an explanation for the letters in the serial on another forum but can't remember where. It seems logical that N is November?

Edit: how would it work with 3 J's

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[stewham]

Yep that would make it November 1968.