Swiss gold chronograph with tachymeter and telemeter Circa 1920

Gold Chronomètre Chronographe
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A fine Swiss 18 carat gold open faced keyless lever chronograph pocket watch with a 30-minute register, tachymeter and telemeter, circa 1920. White enamel sector dial with black Arabic hours, outer minutes and fifths of a second track with red Arabic 24-hour numerals, tachymeter and telemeter scale, subsidiary seconds at 6 o’clock, 30-minute register at 12 and moon hands. Plain case. Dial, case, cuvette and movement signed case and movement numbered.
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Diameter: 51 mm
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Signed: Minerva Fab. Suisse