IWC rare 18k pink gold wristwatch Portuguese reference 3531, self winding, Switzerland around 1995, 3-piece construction case on both sides glazed, snap on case back and bezel, original leather strap with original 18k pink gold buckle, silvered dial with Arabic numerals, central rotor with segment in 21 ct gold, 36 jewels, calibre 891/2, 5 times adjusted, flat rim balance, flat hairspring, incablock shock-absorber, movement with stripe & circular graining or with blued screws decorated, diameter approx. 34 mm, signs of use due to age, IWC box enclosed, condition 2,property of a collector