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The M series 16570 I purchased in 2009, has the serial number on the rehaut and case.
A side note reference the case serial no. has T stamp indicating it is transitional. Wether this indicates the early transition from 3185 to 3186 movements or transition to SEL?
This watch has the 3186 mvt. The 16710 GMT I have is fitted with the 3185 mvt and both keep exceptionally accurate time.
If it's a 16570 with 3186 movement, the M serial # and above should get what you are looking for. Many of the trusted sellers here can probably easily source one for you.
Good luck
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