AUDEMARS PIGUET ROYAL OAK CONCEPT CW1 TOURBILLON Reference: 25980AI. Serial number: E 88197. Alacrite case. Skeleton dial (power reserve, seconds). Hand-wound mechanical movement (calibre 2896), no. 543742. Fabric strap on steel folding clasp signed Audemars Piguet. Sapphire crystal. Circa 2003. Diameter: 44 mm. An alacrite wristwatch mechanical movement, by Audemars Piguet. Circa 2003. The Audemars Piguet CW1 was designed to commemorate the 30th anniversary of the Royal Oak in 2002 in an edition of 150. This watch is innovative in the materials used in its design, alacrite 602, an alloy containing cobalt, chromium, tungsten, nickel, iron and carbon, which was developed for the aerospace industry. But also in the development of its movement by Renaud and Papi, owned by the Manufacture since 2000.