In late 2016, IWC unveiled the Da Vinci Perpetual Calendar IW3921, ahead of its debut at SIHH 2017. This model pays homage to the original 1985 Da Vinci Perpetual 3570, featuring a stepped round case and movable lugs. Measuring 43mm in diameter and 15.5mm in height, it houses the self-winding caliber 89360, complete with a flyback chronograph and perpetual calendar. The IW3921-03 version boasts a stainless steel case and a stylish slate grey dial, complemented by a black Santoni strap.