IWC Perpetual Calendar in 18k gold on leather strap with 18k tang buckle. Auto w/ sweep seconds, moonphase, and perpetual calendar. 34 mm case size. Ref 2388976. Circa 1990's. Fine Pre-owned IWC Watch. Certified preowned Classic IWC Perpetual Calendar 3758 watch is made out of yellow gold on a Black Leather Strap band with a 18k tang buckle. This IWC watch has a 34 x 34 mm case with a Round caseback and White Stick dial. Circa: 1990s . It is Gray and Sons Certified Authentic and comes backed by our 12-month warranty. Each watch is inspected by our certified in-house Swiss-trained watchmakers before shipment including final servicing, cleaning, and polishing. If you have inquiries about this IWC Perpetual Calendar watch please call us toll free at 800-705-1112 and be sure to reference W521771. Watch is in Excellent condition.