Rolex Submariner 5513 Pre-Comex Helium Escape Valve 1977's for $30,392 for sale from a Trusted Seller on Chrono24
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. #
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Rolex] Helium escape valve on a watch on a wrist in the woods. : r/Watches