nickel lever movement, 17 jewels, free-sprung mono-metallic compensation balance, adjusted to 3 positions, silvered dial, applied faceted baton numerals, three engine turned subsidiary dials for constant seconds, 30-minute and 12-hour registers, outer scale calibrated for tachometer, Oyster case with screw-down crown and case back, polished chamfered bezel, case, dial and movement signed, with a stainless steel Rolex Oyster bracelet and folding clasp
The 'Pre-Daytona' stands as the bridge between the vintage chronographs of the 1930s-1950s and the more modern angular styling of the 'Cosmographs/Daytonas'. As with the majority of earlier Rolex chronographs, the 'Pre-Daytona' bore a tachometer scale upon its dial. With the launch of its successor, the 'Daytona' ref.6239, the tachometer was removed from the dial and placed onto the bezel. The new 'Daytona' models were also fitted with dials incorporating a standard base colour with differently coloured subsidiary dials; the 'Pre-Daytona' was usually fitted with a single tone silvered dial. The 'Pre-Daytona's' unique appearance can, therefore, be attributed to its bridging position in the development of Rolex chronographs, it is also the last Rolex chronograph to have been made with a smooth bezel. Interestingly, the 'Pre-Daytona' case is the same as that of the later vintage 'Daytonas.'
For examples of the 'Pre-Daytona', see: I Cronografi Rolex - La Leggenda, Pucci Papaleo Editore, pp. 278-290.
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