ChronographComplicated watch with a function for measuring short time periods in addition to its function for permanently displaying hours, minutes and seconds. ChronometerLabel given to a watch which has undergone precision tests and received a certificate from an official body (COSC). DateThe day of the month, displayed in a window on a watch dial typically at the 3 o'clock or 6 o'clock position. Helium escape valveDecompression system which allows helium to escape from inside the watch when the watch is worn for professional use in pressure chambers. (Long-term underwater work, crude oil exploration, etc.) Screw-in crownSelf-locking crown, screwed into the tube of the case, used for highly water resistant divers' watches. Small secondsA hand on a sub-dial which tracks seconds; typically it completes a full rotation in one minute. Transparent case backA transparent case back - frequently made of sapphire - makes it possible to see the movement inside the watch. Unidirectional rotating bezelA bezel which turns in only one direction. Particularly useful for divers who cannot accidentally rotate it in the wrong direction, which could cause them to miscalculate their dive times. A rotating bezel makes it easy to measure elapsed time.
CrystalDomed scratch-resistant sapphire crystal with anti-reflective treatment on both sides CaseSteel DialBlack Water resistance600 m (2000 feet) SizeGentsCase Diameter: 45.5 mm
Caliber: Omega 9300 Self-winding chronograph movement with column wheel mechanism and Co-Axial Escapement for greater precision stability and durability of the movement. Silicon balance-spring on free sprung-balance, 2 barrels mounted in series, automatic winding in both directions to reduce winding time. Rhodium plated finish with exclusive Geneva waves in arabesque. Power reserve: 60 hours