OMEGA chronograph Speedmaster, self winding, Switzerland around 1976, reference 176.0012, stainless steel case including original bracelet with deployant clasp, screwed down case back with Seamaster-Symbol, tachymeter- mineral glass, black dial, luminous indexes & -hands, day & date at 3, 24-hour-display at 12, copper coloured movement calibre 1045, 17 jewels, diameter approx. 42 mm, length approx. 20 cm, signs of use due to age, condition 2-3