The Cartier Santos ref: WHSA0015 features a stainless steel case with a transparent skeleton dial. This model has a manual winding movement, powered by the 9611 MC caliber. With a case diameter of 40mm, it presents a modern aesthetic while showcasing the intricate mechanics within. The skeleton design allows for a clear view of the movement, emphasizing the watch's technical aspects. This piece combines functionality with a unique visual appeal, making it a noteworthy addition to any collection.