IWC astronomical 18k yellow gold wristwatch Portofino perpetual calendar, self winding, Switzerland around 1993, reference 3541, two- piece construction case including leather strap with original 18k yellow gold buckle, screwed-down case back & winding crown, sapphire crystal, silvered duotone dial with Roman hours, blued steel hands, display of hours, minutes, sweep seconds, day, date, month, moon phase & year, gold-plated movement, 36 jewels, calibre 37582, central rotor with 21k gold segment, incablock shock- absorber, adjusted in 5 positions, diameter approx. 35 mm, signs of use due to age, condition 2-3

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