The ref 6305 is an interesting watch as it has the hybrid feel of the Rolex Bubbleback and Datejust. This is an early Rolex Datejust ref 6305-1 Datejust Ovettone (known by their Italian nickame ‘Ovettone’ (big egg) due to the exceptional depth of case) from the year 1953 using the early A296 semi bubbleback movement in my favourite 18k rose gold. Despite it having the semi bubbleback movement, the watch is highly accurate for its age....
The Rolex Big bubbleback series leading to the Datejust consists of the following
Rolex ref 4467 (solid Gold from year 1945-1949)
Rolex ref 5030 (Solid gold) , Bi colour steel and gold 5031, 5075, 6031 (from year 1949 - 1950),
Rolex ref 6075, 6074 (Bi colour from year 1950 - 1953)
Rolex 6104, 6105 (Bi colour modified A296,from year 1951 - 1953)
Rolex 6304 , 6305 (A296,from year 1953 - 1956)
Rolex Datejust 6604, 6605, 6609, 1600, 1601,1603, 1607, 1625 (from 1959 - 1977 onwards using Butterfly movement calibre generation features cal. 1065 and later cal. 1565 and 1575.)
Rolex ref 5030 (Solid gold) , Bi colour steel and gold 5031, 5075, 6031 (from year 1949 - 1950),
Rolex ref 6075, 6074 (Bi colour from year 1950 - 1953)
Rolex 6104, 6105 (Bi colour modified A296,from year 1951 - 1953)
Rolex 6304 , 6305 (A296,from year 1953 - 1956)
Rolex Datejust 6604, 6605, 6609, 1600, 1601,1603, 1607, 1625 (from 1959 - 1977 onwards using Butterfly movement calibre generation features cal. 1065 and later cal. 1565 and 1575.)
The Rolex 6305 was made famous by President Eisenhower.