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Hi Brian,
I have some additional info on mine for you to digest.
MK, Serial # followed by case inscription date.
MK2 228xxxx III.69
MK4 250xxxx I.70
MK4 269xxxx I/70
MK4 286xxxx I/.70
MK4 3061xxx III.70
MK6 3066xxx no date inscribed
Hope this helps.
Paul
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