Cartier Santos de Cartier Skeleton WHSA0015. 39.8 mm polished stainless steel case. 7-sided crown set with synthetic spinel. Silver skeleton dial. Roman numerals. Swiss made, Manual movement. Caliber 9611 MC. 20 jewels, 138 parts, 72 hours power reserve. Quick release stainless steel bracelet and additional blue leather strap with folding buckle.