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ebay Siffert 301124769831

I am not sure,
it is a 225xxx, I think 1971, a serial number out of 3rd batch and out of GMT's section ?, this dial is Mk6 1972 and I would expect 242-245 from the 5th batch of cases ?

normaly one can think about the usual transitional story but there is batch 4 between?
would expect cal 11 with that case number, and cal 12 with dial, seller do not answere the question about movement.
what did you think?
cheers
mich

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