OMEGA chronograph Speedmaster Professional Mark III, self winding, Switzerland around 1972, reference 176.002, solid stainless steel case including original bracelet, screwed down case back with sea horse logo, blue contrast dial, 60-minutes- & 12 -hour-counter, permanent second & 24- hour-display at 9, tachometer graduation, movement gold-plated, 22 jewels, central rotor, calibre 1044, flat rim balance, flat hairspring, incablock shock-absorber, measures approx. 52 x 42 mm, length approx. 20,5 cm, condition 2, property of a collector