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Always interesting to see things like this, just goes to show that you can't go by the websites that date your Speedy etc. based on movement serial number as that one would have been comfortably within '69 going by the serial.
I'd love to get extracts for a couple of mine but can never face the outlay(plus my wife would kill when I tell her what the money was spent on).
Maybe 71 in that case?
Haha yes for the Seamaster I posted today I thought it could also have been 1969.
If I use https://www.ilovemyspeedmaster.com/productiondateprediction/ for the Mark II it actually says May 1970 which is pretty good I would say.