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, no. 2833604, circa 1971, automatic movement, 26 jewels, cal. 1520, black replacement service dial, applied luminous dot and baton markers, luminous pointed baton minute and Mercedes hour hands, centre seconds hand, rotating black bezel with Arabic numeral 10 minute track, helium escape valve, screw down crown, screw down case back, stamped ROLEX COMEX, on a Rolex stainless steel Oyster bracelet with fold over clasp, case back, dial, movement, crown and clasp signed, diameter 39mm, bracelet 17.5cm Coming from the family of the owner, this dive watch was worn by Johny Henry Simpson, who was more commonly known as Jack Simpson. John joined the Royal Navy prior to the 2nd World War, where he was deployed on Arctic Convoy duties. These were some of the most hazardous convoys carried out by both the Merchant and Royal Navy personnel. During his time spent in the service of the Royal Navy, John had learnt to dive. By the time he left the Royal Navy he was fully qualified as a Diver. This allowed him to gain the position as a diver on the Manchester Ship Canal, where he worked on the main dock area at the Manchester end of the canal. Here John became one of the top divers and went on to train many of the assistant divers. One of his pupils joined Comex to work on the North Sea rigs. During this time John was approached with further recommendations for divers to work at Comex, with eventually John being asked himself to dive with Comex on the rigs. John did this for a short while, but eventually had to give up diving due to health issues. Upon retiring from his diving career he was presented with this Rolex Submariner by his initial pupil. This Submariner, the reference 5513, features a helium escape valve at 9 o’clock, a new development for divers working from a diving bell in a helium-rich environment. This is the earliest example of the use of an HEV, a detail that would be used in the Submariner reference 5514 and finally find a home in the Rolex Sea Dweller reference 1665.