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Rolex 6605 Datejust from 1957
This is a Rolex 6605 Datejust in 18k gold with the single Swiss, pie Pan dial and early Dauphine hands. This is the generation before the Rolex 1601, 1600, 1603.

Many has mistaken the 6605 to be the first series Big Bubbleback as it resembles the earlier Rolex 4467 Big Bubbleback in term of case shape and similar looking lugs.