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 hand guilloch_ hobnail pattern and the original dial of the famous Calatrava Ref. 3919 first introduced in the mid 1980's. The watch is made entirely of 18K yellow gold which contrasts wonderfully with the silvery-grey dial that displays the standard hours and minutes indication. Lastly, the case back is transparent and the yellow gold bracelet has a deployment clasp.