Presented on a grey leather strap, this Speedmaster Racing Master Chronometer model features a 44.25 mm stainless steel case with an 18K Sedna™ gold bezel. The silicon nitride bezel ring includes the famous tachymeter scale in OMEGA Ceragold™.
On the matt grey dial, there is a distinctive racing style minute-track which gives the watch its name. There are also two subdials with rhodium plated applied rings as well as a 6 o’clock date window that blends with the colour of the dial. The hour and minute hands and arrowhead indexes are 18K Sedna™ gold with white Super-LumiNova.
The watch is driven by the OMEGA Co-Axial Master Chronometer 9900, certified by METAS at the industry’s highest standard.

Features
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).
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.
Time zone function: Allows the hour hand to be easily adjusted to different time zones without stopping the watch.

Technical Data
Reference: 329.23.44.51.06.001
Between lugs: 21 mm
Lug‑to‑lug: 50.00 mm
Thickness: 14.92 mm
Case diameter: 44.25 mm
Case: Steel
Dial colour: Grey
Crystal: Domed scratch‑resistant sapphire crystal with anti‑reflective treatment on both sides
Water resistance: 5 bar (50 metres / 165 feet)
Total product weight (approx.): 112 g
Calibre: Omega 9900
Movement Type: Self winding
Power reserve: 60 hours

Strap
Strap color: Grey
Strap type: Leather strap
Strap surface: Alligator leather
Strap underside: Non‑grained calf leather
Buckle type: Foldover clasp
Buckle material: Stainless steel