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Peter is correct as to the 14060M and the inherent issue date and COSC certification.
Additionally, the 14060M "M" suffix involves the caliber internal changes within the 3130 movement,
as a Breguet over coil and full balance bridge.
An excellent article by Paul Altieri on the 14060/14060M is titled "Last of the Best".
It is recommended reading for those interested in these Rolex Submariner references.
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