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 1949 - 1950) start of the bi color steel gold watches
Rolex 6075 fluted bezel, 6074 smooth bezel (from year 1950 - 1953)
Rolex 6104, 6105 (modified A296,from year 1951 - 1953)
Rolex 6304 , 6305 (A296,from year 1953 - 1956)


