IWC very fine & rare, astronomical chronograph Grande Complication with perpetual calendar & minute-repetition in platinum reference 3770,self winding, Switzerland around 1993, limited edition of 50 pieces, solid, 3-piece construction case, case back 6-times screwed, screwed down winding crown, snap on bezel, leather strap with original platinum buckle, enamel colored dial with raised indices to the edge at 4/5 slightly rippled, display of hours, minutes, constant second, perpetual calendar (day, date, month, year, moon phase) & chronograph, minute-repetition triggering by slider at 9, rhodium plated movement, calibre 79091, 68 jewels, fausses cotes decoration, diameter approx. 42 mm, calendar has to be adjusted, original box damaged, blank warranty card & description enclosed, overhaul recommended at buyer's expense, condition 2-3, property of a collector