Detail of escape valve and case. The Ref. 5514 was a COMEX specifi c watch, which was never available to the general public. Due to the extreme conditions in which the COMEX divers operated, every six months the watches were sent back to Rolex for an overhaul. These watches were not just meticulously overhauled but in many cases were upgraded each time the watch returned to Rolex. Former COMEX divers have reported that some of the earlier Ref. 5514 watches did not have the COMEX logo on the dial, such as this example and that when these watches were sent to Rolex for service, on request they were replaced by Rolex with the later gloss tritium or luminova dials, some bearing the COMEX logo. Casebacks were often changed as well such as this example during its last service at Rolex in May 2017.