IWC PORSCHE DESIGN chronograph, Switzerland around 1980, self winding, reference 3700, 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, signs of use due to age, length approx. 19 cm, condition case 2-3, condition movement 2