This timepiece is a version of the Calatrava “Clous de Paris”; Patek Philippe's best known watches of all time. The timeless design of the case starts with the unique round domed look of the bezel and a dial similar to the original dial of the famous Calatrava Ref. 3919 first introduced in the mid 1980's has been retained and adapted in a larger more contemporary size with a diameter of 37mm (formerly 33.5mm). The platinum case looks wonderful with the silver dial that displays the standard hours and minutes indication alongside a subsidiary seconds subdial located at the 6 o'clock. Lastly, the strap is made of a black crocodile leather.