Ref. ST 145.022 – 78, chronograph, minute and hour counters, black dial, calibre 861; “Speedmaster Professional”; stainless steel

Stainless steel, manual-winding, vertical “tonneau”-shaped, gentleman’s wristwatch, water-resistant with screwed case-back, movement protected inside a soft iron calotte (protective container) against magnetic fields, bezel with black insert, black colour dial with radial applied indexes, subsidiary seconds at 9 and three horological complications:

· 1/8 second chronograph (activated by the two round-shaped push-pieces located on the case-band) with tachometric scale graduated on the bezel for 500 units per hour

· Half-instantaneous 30-minute counter (subsidiary dial at 3 o’clock)

· Dragging 12-hour counter (subsidiary dial at 6 o’clock)

Case-back stamped in the centre with the Omega logo, the sea-horse and the name “Speedmaster”, surrounded by the mentions “Flight-qualified by Nasa for all Manned Space Missions” and the “First Watch Worn on the Moon”.

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