krogerfoot
·This 1950s (edit: 1960s) Seamaster 166.011 from a reputable and well-known seller has an odd double-stamped caseback. Has anyone seen anything like this before?
Edited:
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That just looks like an oops in manufacturing, I thought you meant double stamped as in two references but that one is just a case of it being struck twice with one of those being slightly out of alignment
Serial says -65 btw