Omega Speedmaster Professional Reference #: 345.0022

• Case: 42mm stainless steel with twisted lyre lugs and asymmetrical pusher guards. 

• Crystal: Domed Hesalite (acrylic) crystal (standard for this reference; sapphire versions typically carry different references like 3592.50).

• Dial: Black matte with three sub-dials.

  • Lume: Early models (1988–1996) feature Tritium (marked T<25 on dial), developing a warm patina.  Later models (1997+) switched to Luminova (no T marking), which remains white.

• Bezel: Black anodized aluminum tachymeter bezel (typically "Dot Next to Ninety" or DNN scale). 

• Case Back: Solid stainless steel with the "First Watch Worn on the Moon" engraving (often the "Straight Writing" or later laser-etched versions). 

• Water Resistance: 50 meters (5 ATM). 

• Bracelet: If equipped, typically the Omega Ref. 1499 flat-link stainless steel bracelet with end links Ref. 842 or 849. 

The watch is powered by the Omega Caliber 1861, an upgraded version of the legendary Caliber 861. 

• Type: Manual-winding chronograph.

• Base: Derived from the Lemania 1873.

• Frequency: 21,600 vibrations per hour (3 Hz). 

• Jewels: 18 jewels (an increase from the 17 jewels in the Cal. 861, due to an added bridge). 

• Power Reserve: Approximately 48 hours. 

• Features: Hacking seconds, shuttle-cam chronograph mechanism (robust and service-friendly). 

• Finishing: Rhodium-plated with fausses côtes decoration.