Case material: Steel; Charge: Manual; Conditions: New Presentation condition : With boxes and all papers; Model: Royal Oak Tourbillon Concept Price on request Gmtbroker Reference: 25980AI.O.0003SU.01 audemars piguet original production royal oak "concept" tourbillon in a super rare "alacrite" material. limited to only 150 pieces the concept watch is both radical and comfortably familiar, a combination rarely encountered in cutting edge designs. with its main body fashioned from alacrite 602, a space age alloy previously used primarily in aerospace and medical applications, and a revolutionary new shock absorption design for the tourbillon cage, as well as the new crown function clutching system, the cw1 is conceived and produced for the physically active high horology aficionado of the 21st century. alacrite 602 is a new super alloy consisting of 57% cobalt, 31% chrome, 5% tungsten, with trace amounts of carbon, silicon, and iron. this particular form of alacrite has a vickers hardness rating of 430. extremely difficult to machine, each concept watch case requires nearly 60 hours to complete (compare to just under 2 hours for each royal oak in stainless steel, itself already considered one of the most difficult and time-consuming cases in high horology to produce.) as a celebration and homage to its genetic forebear, the cw1 retains the trademark three plane octagonal bezel with exposed hex screw heads. the bezel is machined from high grade titanium. for the royal oak concept watch, audemars piguet let loose the technical wizards at renaud et papi. the