OMEGA 18k white gold gents wristwatch series Constellation chronometer, self winding, Switzerland around 1973, reference 1537255, snap on case back, sapphire crystal, blue dial in clous de Paris decoration & raised indexes, display of hours & minutes, movement copper coloured, 24 jewels, calibre 715, diameter approx. 33 mm, length approx. 18,5 cm, condition 2, property of a collector