OMEGA Seamaster chronograph, manual winding, Switzerland around 1971, reference 145.029, stainless steel, screwed down case back with Seamasterlogo, gray dial with tachometer graduation, 30 minutes- & 12 hour-register, movement gold-plated, 17 jewels, calibre 861, incablock shock-absorber, flat hairspring, neutral grosgrain, diameter approx. 39 mm, condition 2, property of a collector