OMEGA chronograph Seamaster Professional, Switzerland around 1996, self winding, reference 1780504, chronometer in stainless steel including bracelet with deployant clasp & divers extension, blue wave dial with luminous dots, luminous hands, date at 3, sapphire crystal, screwed-down case back & winding crown, helium valve outside at 10, unidirectional revolving bezel, calibre 1154 (Valjoux 7750), diameter approx. 42 mm, length approx. 19,5 cm, condition 2-3, property of a collector