IWC Ingenieur 3540

IWC | Ingenieur Perpetual Calendar, Reference 3540 | A yellow gold and diamond-set perpetual calendar bracelet watch with moon phases and digital year display, Circa 1990

IWC Ingenieur Perpetual Calendar, Reference 3540 A yellow gold and diamond-set perpetual calendar bracelet watch with moon phases and digital year display, Circa 1990 Dial: white Calibre: cal. 35782 automatic, 37 jewels Case: 18k yellow gold, screw down case back Case number: 2’374’395 Closure: 18k yellow gold IWC bracelet and folding clasp Size: 36 mm diameter, bracelet circumference approximately 180 mm Signed: case, dial and movement Accessories: none Unbeknownst to most people, the first IWC wristwatch to house the famous Kurt Klaus perpetual calendar was not the famous Da Vinci, but was in fact a member of the Ingenieur line. Produced for a very short time between 1987 and 1992, the present reference 3540 was the successor to that first model, and served as the equally complicated but slimmer and dressier compatriot to the bolder Da Vinci. Though IWC was not early to the perpetual calendar party, the ingenious Kurt Klaus mechanism allowed the entire complication to be adjusted by the crown, no small feat considering Audemars Piguet first introduced this ability in 2025.萬國 工程師系列 Perpetual Calendar 型號3540 黃金萬年曆鏈帶腕錶，備月相及數位年份顯示，約1990年製