Swiss 18 carat gold open faced keyless lever watch Circa 1930

Gold minute repeating chronograph with register and tachometer
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A fine and rare Swiss 18 carat gold open faced minute repeating chronograph keyless lever pocket watch with register and tachometer, circa 1930. Rhodium-plated movement, Geneva striping decoration, 31 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with overcoil, index regulator, repeating on gongs activated by a slide on the band, centrifugal governor. Gold hinged cuvette. White enamel dial with black Breguet numerals, outer minute track and fifths of a second divisions, outermost tachometer scale with red, blue and black numerals, subsidiary seconds and 30-minute register dials and original gold spade hands. Polished case. Case numbered.
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Diameter: 53.5 mm
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Signed: No name