Oris Aquis Depth Gauge - 01 733 7755 4154-Set RS

Features Oris's unique & patented Depth Gauge: Water enters a channel in the sapphire crystal itself via an inlet at the 12 o'clock position. As the water pressure increases at depth, the air inside the channel gets compressed - the line where water and air meet indicates the depth. The depth scale indications is printed in yellow on the dial perimeter & is indicated in meters (from 0-100m). 
Stainless steel case.
Matte black ceramic bezel
Black dial.
Polished steel index hour markers with luminous fill.
Polished steel hands with luminous fill.
Date window displayed at the 6 o'clock position.
Case back engraved with a meters to feet conversion scale
Includes waterproof presentation box
Oris Caliber 733 base SW200-1, beats at 28'800 vph, contains 26 Jewels & has an approximate power reserve of 38 hours.