Pre-owned/unworn Oris Aquis Depth Gauge ref 01 733 7755 4154-Set RS is often lovingly referred to as the “watch with a hole” because of the tiny hole located on the sapphire crystal. The gauge measures the wearer’s depth using the Boyle-Mariotte Law. As the wearer dives below the ocean’s surface, water enters the hole and through a channel milled into the crystal, thus displaying the current depth alongside the gauge presented in yellow surrounding the dial. This innovative concept has since won over luxury watch enthusiasts of all lifestyles and professions, and it can be yours today in UNWORN pre-owned Oris condition. Shop Oris Aquis Collection