Fine gold pocket watch with split-seconds chronograph Circa 1920

Keyless pocket watch with split-seconds chronograph
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A fine 18 Carat yellow gold keyless pocket watch with split seconds chronograph and instantaneous thirty minute register, made by Longines Saint-Imier, Switzerland Circa 1920.
Four body demi bassine and polished case with 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.
White enamel dial with bold painted Arabic numerals, outer minutes/seconds divisions with every five Arabic markers in red, subsidiary seconds dial and 30-minute register with red numerals. Blued steel spade hands.
Frosted gilt movement with straight-line lever escapement, monometallic balance, self-compensating Breguet balance spring and a visible split-seconds mechanism.
Dial, case, cuvette and movement signed.
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Diameter: 52 mm
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Signed: Longines
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Rattrapante chronographs also referred to as split-seconds chronographs, are a type of chronograph with two seconds hands that allow for the ability to time multiple simultaneous events, such as runners during a race. It can also time a series of events, such as the laps a single person makes on a track.