Patek Philippe Annual Calendar Chronograph Steel Black 5960/1A-010 2018 [Preowned]Overview The Patek Philippe 5960 1A 010 represents a remarkable fusion of technical sophistication and sporty elegance, offering a rare glimpse of high complication within a stainless steel casea material Patek Philippe typically reserves for only its most select and distinctive references. This particular model, introduced in 2017 and notably discontinued in 2018, had an exceptionally brief production run of just one year, making it especially rare.