Audemars Piguet Skeleton Royal Oak

 .. The Royal Oak was created in 1972 by legendary watch designer Gerald Genta and retains the same features of the original to this day. 
Named after the British Royal Navy Battleships, the Royal Oak features an octagonal bezel inspired by the shape of the ships cannon scuttles. This model has a mid-sized 39mm case and is openworked meaning it is possible to see the entire inner mechanism of the watch. 
By @swisswatches ・・・
via Instagram