Self-winding chronograph movement, rotor bi-directional winding, 28,800 A/h, 42 jewels, Kif shock protection, power reserve 72 hours. Cal. 4160 contains a programmable timer with functions set using the special “Ring Command” bezel on the watch.
The similar Cal. 4161 was introduced in 2013 with the stainless steel Yacht-Master II Ref. 116680.