Audemars Piguet 40th anniversary Royal Oak Edition (2012).  Stainless steel case in 39mm with a thickness of 7mm.  Automatic caliber 2121, derived from Jaeger-LeCoultre’s legendary ultra-thin JLC 920 calibre movement.  Power reserve is 40 hours. Priced at €19800 (at the time of the launch in 2012)