Oris Depth Gauge

Oris depth gauge, with a patented system that uses the Boyle-Mariotte Law to measure the depth during a dive. 46mm stainless steel case and bracelet with push button release deployant clasp. Black dial with a black ceramic bezel. Date window, screw-down crown and water resistant to 50bar. Powered by an automatic Oris 733 movement.  Supplied with the original waterproof presentation box containing bracelet tools and the gauge cleaning kit. Circa 2022.