Swiss gold split-seconds chronograph pocket watch Circa 1920

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A very fine Swiss, 18 Carat gold, a keyless pocket watch with a split-seconds chronograph and instantaneous 30-minute register, circa 1920. Retailed by Cuervo y Sobrinos.
A polished case, split-seconds gold push-button on the band at 11 o’clock, co axial button in the crown for start/stop and return-to-zero of the chronograph. Hinged gold cuvette engraved with the Grand-Prix prize medals.
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White enamel dial with bold painted numerals, outer minute track, outermost fifths of second chronograph divisions, red painted Arabic five seconds numerals, subsidiary seconds dial and 30-minute register with red numerals. Blued steel Breguet hands.
A frosted gilt movement, 21 jewels, straight-line lever escapement, monometallic balance, self-compensating Breguet balance spring, cam micrometre regulator, visible split-seconds mechanism. Dial, case, cuvette and movement signed.
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Diameter: 52 mm
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Signed: Longines  Swiss
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The case has some dents.