The Da Vinci Perpetual Calendar IW9252-13 boasts a polished Red Gold case and a White dial. This iconic watch first debuted in 1985 with its revolutionary perpetual calendar mechanism, causing a stir in the industry. It quickly became a bestseller and was used in various IWC and JLC models, including the elegant Master Ultra Thin Perpetual. The 3750 model features a 39mm case with hinged lugs and was available in different metals and dial colors. Customers could also request a sapphire crystal instead of the standard plexi glass. For a touch of luxury, there was a gem-set option with the reference 8153. The 3758 was later introduced in 2005 as its