Rolex a rare 14ct gold chronograph wristwatch Ref 3666 case 3070492, circa 1940, manual winding nickel lever movement, champagne dial with printed alternate Arabic and numerals and baton indexes, outer seconds and red printed telemetre scale, inner red spiral snail scale, subsidiary dials for constant seconds and 30-minute register, blued steel hands, polished case, snap-on case back, winding Crown flanked by two rectangular chronograph pushers, down-turned lugs, case, dial and movement signed, diameter 35 mm .