IWC Ingenieur Perpetual: gold wristwatch with perpetual calendar, ref. 3540, 1990

18k yellow gold case, white dial with golden hands, sapphire crystal, screw-down crown. Movement: automatic, IWC C.79252. Functions: hours, minutes, seconds, perpetual calendar with date, day, month, four-digit year display, moon phase.
Black leather strap with golden buckle, width 20.5 cm.
Case dimensions: 34 mm (excluding crown) x 47 mm (from lug to lug).
Item condition grading: **** good.
Original box and papers.