IWC PORSCHE DESIGN chronograph, Switzerland around 1980, self winding, reference 3704, titanium case including bracelet with deployant clasp, screwed down case back, sapphire crystal, display of hours, minutes, constant second, day, date & chronograph, base calibre Valjoux 7750, central rotor, incablock shock-absorber, diameter approx. 42 mm, length approx. 20 cm, condition 2-3, property of a collector