Seamaster Diver 300M 44 mm

Antimagnetic: The movement resists magnetic fields in excess of 1.5 tesla (15,000 gauss).
Master Chronometer certification: This certification guarantees the highest level of precision, performance and magnetic resistance in Swiss industry, as established by the Swiss Federal Institute of Metrology (METAS).
Chronograph: The chronograph function is a mechanism for measuring time intervals. A chronograph watch can therefore time events while continuing to indicate the time in the same way as a traditional watch.
Chronometer: Designation of a watch that has passed precision tests and received a certificate from an official organization (the COSC).
Screw-in crown: self-locking crown screwed into the case tube, used for highly water-resistant diving watches.
Date: The day of the month, displayed in an aperture on the watch dial at 3 or 6 o’clock, or in a counter at 9 o’clock.
Time zone function: Allows the hour hand to be easily set to two time zones, without stopping the watch.
Transparent back: A transparent back, often sapphire, allows the movement inside the watch to be seen.
Unidirectional rotating bezel: Bezel turning in one direction only. Particularly useful for divers, as they can’t accidentally turn it in the wrong direction and thus miscalculate their dive times. A rotating bezel makes it easier to measure elapsed time.
Small seconds: Sub-dial hand marking the seconds. It usually completes one full rotation in one minute.
Helium valve: Decompression system allowing helium to escape from the watch when worn by professional divers (long-term underwater work, offshore oil exploration, etc.).

Reference number: 210.30.44.51.01.001
Lug spacing: 21 mm
Height from horn to horn: 52.80 mm
Thickness: 17.20 mm
Case diameter: 44 mm
Case: Steel
Dial color: Black
Glass: Domed, scratch-resistant sapphire crystal with anti-reflective coating on both sides
Water resistance: 30 bar (300 meters/1,000 feet)
Total product weight (approx.): 225 g
Caliber: Omega 9900
Movement type: Self-winding
Power reserve: 60 hours

Material: Steel
Clasp type: Folding clasp with ease of use and plunger extension