Silver-tone stainless steel case. Two-tone (silver-tone and yellow gold-tone) stainless steel and 18kt yellow gold oyster bracelet. Fixed tachymeter scale bezel in yellow gold-tone 18kt yellow gold. Black dial with yellow gold-tone hour markers, luminous minute hands and hour indices. Minute markers on the outer rim. Sapphire crystal glass. Screwdown rotating bezel clasp (crown). Solid case back. Round analog watch face measuring 40 mm in diameter. Water resistant up to 100 meters / 330 feet depth. Chronograph functions with a central chronograph hand, minutes and hours sub-dials at 3 and 6 o'clock positions respectively, and an additional seconds sub-dial. Automatic self-winding movement (Rolex Calibre 4130) beating at 28800 vph (5 Hz), contains approximately 44 jewels, is a chronometer with a power reserve of about 72 hours. Men's Cosmograph Daytona model Ref. 116523 BKSO.