IWC's Da Vinci Perpetual Calendar IW9253-12 boasts a dazzling White Gold case and a diamond-encrusted dial with ruby hour markers. This revolutionary model first introduced the perpetual calendar mechanism to wristwatches in 1985 with the reference 3570, causing quite a stir in the industry. It became the most popular mechanism, not only in the Da Vinci collection but also in other IWC and JLC models. The watch measures 39mm by 14.3mm and comes in various metals and dial colors, with different language options available. The original version featured plexiglass, but later models offered a sapphire crystal option. The 3758 model succeeded the 3750 in 200