Speedmaster Moonphase 44.25 mm

Anti-magnetic : The movement is unaffected by exposure to strong magnetic fields, even those greater than 1.5 tesla (15,000 gauss).
Chronograph : The chronograph function is a mechanism for measuring time intervals. A chronograph watch can therefore be used to time events while displaying the time like any traditional watch.
Chronometer : Label given to a watch which has undergone precision tests and received a certificate from an official body (COSC).
Date : The day of the month, displayed in a window on a watch dial at the 3 or 6 o’clock position, or within a subdial at 9 o’clock.
Master Chronometer Certified : Guaranteeing the Swiss industry’s highest standard of precision, performance and magnetic-resistance, as set by the Swiss Federal Institute of Metrology (METAS).
Moonphase : A moonphase watch uses a function which tracks the phases of the moon. One lunar cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds and includes four phases: new moon, first quarter, full moon, last quarter.
Small seconds : A hand on a sub-dial which tracks seconds typically it completes a full rotation in one minute.
Tachymeter : A tachymeter watch has a function for measuring speed. It is a chronograph with a graduated dial on which speed can be read in kilometres per hour based on a 1000 metre distance.
Transparent caseback : A transparent caseback – frequently made of sapphire – makes it possible to see the movement inside the watch.

Reference : 304.30.44.52.01.001
Between lugs : 21 mm
Lug‑to‑lug : 50.0 mm
Thickness : 16.9 mm
Case diameter : 44.25 mm
Case : Steel
Dial colour : Black
Crystal : Scratch‑resistant sapphire crystal with anti‑reflective treatment on both sides
Water resistance : 10 bar (100 metres / 330 feet)
Watch size : Gents
Total product weight (approx.) : 202 g
Calibre : Omega 9904
Movement Type : Self winding
Power reserve : 60 hours

Material : Steel
Type of Clasp : Foldover clasp with comfort setting