Cartier, Santos 100, a gentleman's black chronograph wristwatch, circa 2005, ref. 188026 PX, 3104, the two piece screw down case and bezel with black dial, luminous Roman numerals, luminous skeleton tapered hands, date aperture, subsidiary dials running seconds, hours and minutes, 27 jewel Cartier automatic chronograph movement, cal. 8630, the case 54mm including lugs, on a black strap with fold over clasp