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I'm sorry for my poor English

 

Rolex worked closely with COMEX and the US NAVY SEA LAB trough their deep sea divers. This collaboration was fruitful to test the helium escape valve (HEV). The valve was developed and tested on few 5513 before being commercially available in the original Sea Dweller in 1971.
This very rare Submariner 5513 HEV, not sold to the public, with only Rolex and Crown stamped on the case back, was used before Rolex submitted the HEV Patent in 1967.
My father purchased this watch from the wife of Comex's scientific manager when he died.

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