[Ronbo710]

Hi All- I received a 6309-7049 in all original shape from Nov.'77 and noticed the serial # started 7N---- I also checked the date calculator and it was made in November 1977. Was this the reason for the 'N'? Also is/was this done very often (letters in the serial #'s)? Thanks -Ronbo

 

[MartinCRC]

Yes, N for November and D for December. I presume to avoid the use of double digits to denote the month. Not sure about October though. Perhaps an O which could then do unnoticed because of its resemblance to a zero.

Martin

 

[Ronbo710]

Thanks Martin - R

 

[cobrajet25]

Yep, 1234567890 for the first ten months of the year (Jan-Oct), N for November, D for December. In order for the system to work as Seiko intended, they had to come up with a way to account for 12 months with only 10 numbers. This worked. ---A