ROLEX Oyster Cosmograph 'BIG RED' Daytona early reference 6263/6239 serial number 2.7 million, manual winding, screwed down Oyster stainless steel case, black bezel with tachometer graduation, black tritium-dial with silvered sub-dials & raised silvered indexes, original hands, stop-second hand later, rhodium plated movement, calibre Valjoux 727, 17 jewels, beveled cadrature, Rolex screw- balance with free-sprung Breguet-hairspring, adjusted in 3 positions, diameter approx. 37,5 mm, condition 2, property of a collector