CASE : Three-body, polished and brushed, lyre lugs, black tachometer bezel graduated to 500 UPH, screwed-down transparent case back engraved: Omega Speedmaster Professional, First Watch Worn on the Moon sapphire crystals.DIAL : Black with luminous and white painted baton indexes, outer minute/seconds and 1/5th seconds divisions, subsidiary dials for the seconds, the 12-hour and 30-minute registers. Luminous white baton hands.MOVEMENT: Cal. 1863, rhodium-plated, fausses cotes decoration, free-sprung monometallic balance, shock absorber, self-compensating flat balance spring, hack mechanism.Dial, case and movement signed, in good conditionDIAM: 42 mm THICKNESS: 13 mm