this question has been asked many times. so i decided to post a sticky thread
M series has the 'rolex chapter ring' aka the words rolex engraved on the inner case circumference, ie the area between the dial and sapphire crystal. the rolex serial number is engraved @ the 6o'clock position
the last batch of Z series has the rolex chapter ring. however, the earlier batches do not have.
this is why M series is preferred. new design, anti-counterfeit measures.
M series has the 'rolex chapter ring' aka the words rolex engraved on the inner case circumference, ie the area between the dial and sapphire crystal. the rolex serial number is engraved @ the 6o'clock position
the last batch of Z series has the rolex chapter ring. however, the earlier batches do not have.
this is why M series is preferred. new design, anti-counterfeit measures.
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