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Rolex] Helium escape valve on a watch on a wrist in the woods. : r/Watches
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Submariner 'COMEX', Ref. 5513 with helium escape valve | A stainless steel wristwatch with bracelet | Circa 1971 | Fine Watches | 2022 | Sotheby's
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Rolex Sea-Dweller Watches From SwissLuxury
ROLEX - Helium escape valve opens when the difference in pressure between the inside and outside of the watch reaches 3 to 5 bars, allowing helium to escape, thereby protecting the watch. #