Rolex

Both watches share a very similar dial. Both in original form are CR (Chapter ring) dials with swiss signed below. Naturally both are Gilt dials with the depth writing (100m) for both the 6536/1 and the 5508 in silver. The hands are 'mercedes' on both models and both in their original form are also glossy (black laquer dials). The movement on the 6536/1 is a calibre 1030. The 5508 came after the 6536/1 and thus carries the newer movement and successor movement to the 6536/1, calibre 1530 which was a more modern and reliable movement than the 1030. Both are so called 'Butterfly movements' because of the rotor which is shaped like a Butterfly on both the 6536/1 and the 5508 (see picture below). Movement of 6536/1 is on the right, 5508 is on the left.

The outer case back of both references are quite different. The 6536/1 is on the right and is quite different in shape than the smaller diameter case of the 5508 on the left (see picture below). The inner case back ofcourse is marked with the respective dates. On the left you have 5508 which has the smaller diameter also on the inside of the case back. It is also clearly marked with the date 1958. On the right you have the date marked III 1957 - third quarter 1957 of the 6536/1. See picture below.