This is a Rolex 6605 from the year 1957, Q2. Basing on the model number, the Rolex 6605 was only produced from 1956-1959 before it was being replaced by the 1600,1601,1603. This is one of the classic Pre Modern Datejust, which has the overall look and fee
This is another versions of the Big bubbleback. There are several generations of the so called Big Bubbleback namely : Rolex 4467 ( from year 1945-1949) caliber 745, only in solid gold, Rolex 5030 (solid gold) 5031 (Steel and gold) 5075, 6031 (from year 1