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How does a watch you wind with your wrist stay dry 300 metres down? Press the steps, or wait and the watch runs them by itself.×3
water · Rolex300 mreserve · Rolex70 hcalibre · Rolex3230balance · typical4 Hz · 8/sbezel · Rolexturns one wayparts1 watch
The big idea: a screwed-shut case and a screw-down crown keep the sea out to 300 m, and a rotor that swings with the wrist keeps a spring wound for 70 hours (both Rolex's figures), while the balance beats 8 times a second (typical).
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Made by @elvar_official