Oris Watch Big Crown ProPilot X Calibre 115 Skeleton Leather 01 115 7759 7153-Set5 22 04TLC. One of the finest skeleton watches on the market, this Oris Big Crown ProPilot X Calibre 15 Skeleton watch features the brand’s newest in-house developed calibre. The Oris Caibre 115 is a hand-winding mechanical movement which provides an outstanding power reserve of 10 days or 240 hours. The power reserve is fuelled by a mainspring coiled in single oversized barrel, visible through the skeletonised dial at 12 o clock. As you manually wind the movmenet by the crown, you can watch the mainspring coil tight and tighter, allowing you a glimpse into the talents of the Oris watchmakers. The Calibre 115 hand winding movement continues to impress with a large non-linear power reserve fitted to the dial at 3 o clock. This incredible function allows you to see how long you have left before you need to wind the watch again. The masterpiece dial is also kitted with centre hands for hour and minutes and a small subsidiary seconds dial at 7 o clock. The case of the Oris Big Crown ProPilot X Calibre 115 Skeleton watch is crafted from high intensity titanium renowned for its durable and lightweight properties and is left unpolished giving the timepiece an industrial feel. Fitted to the case is the classic Oris ProPilot bezel inspired by jet turbines alongside domed sapphire crystal glass. To complete the look of this Oris ProPilot X watch, a seamlessly integrated black rubber strap and titanium folding buckle.