OMEGA chronograph series Speedmaster, self winding, Switzerland around 1998, reference 1750083/3750083, stainless steel case including original leather strap with deployant clasp, snap on case back with sea horse logo, sapphire crystal, bezel with engraved tachometer graduation, silvered duoton-dial with raised indexes, 30 minutes- & 12 hour-register, date, calibre 1152, 25 jewels, incablock shock-absorber, diameter approx. 38 mm, condition 2, property of a collector