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another hint

 

The first Cosmograph Daytona was reference 6238 and is sometimes referred to as the pre-Daytona Cosmograph.  Rolex retrofitted some of these references with a Daytona dial and bezel (mine has a 1.4m serial).  Apparently it was not unusual for these early models to have "mismatched" casebacks.  So mine is not a 6238.  The movment as you can see is the Rolex 722 movement based on a Valjoux 72 movement.  It still has nearly the entire 42 hour power reserve and of course sports a classic column wheel design.  I've narrowed it down for you...  Any more guesses?  and please keep the pictures coming!






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