Swiss gold chronograph watch with telemetric scale Circa 1920

Gold pocket watch with chronograph by Reymond Frères SA
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Very fine and rare hunting-cased, keyless-winding Swiss pocket watch with chronograph, 30-minute counter and telemetric scale, circa  1920.
Polished 18K yellow gold round-shaped hunting case. Gilded brass 2/3 lever escapement. Enamel dial for the chronograph with Breguet-style radial hours, 24-hour indication, outer minutes/seconds track, subsidiary dial for the seconds at 9, 30-minute counter at 3, telemetric scale, and spade hands.
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Diameter: 51 mm
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Signed: Reymond Frères S.A., Les Bioux
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Reymond Frères SA, Swiss, raw movement producer
Reymond Frères SA was founded in 1901 by the brothers John Reymond and Charles Reymond in Les Bioux and traded under the name ” Valjoux SA ” from 1929. In 1910, the company, which specialized in chronograph movements, moved into a factory building maintained by the municipality of Les Bioux. In 1914, the military in World War I needed reliable wrist chronographs. As a result, the 13-line chronograph calibre 23 (diameter 29.33 millimetres, height 5.85 millimetres) was developed, which was released in 1916was ready for series production and was soon ticking in the wristwatches of very different manufacturers (e.g. Audemars Piguet, Patek Philippe, Rolex, Vacheron & Constantin ). Production lasted almost sixty years, and by 1974 a good 125,000 ebauches of this type had been made. The generation change took place with the name change in 1929, and the Reymond sons, Marius and Arnold, took over the company.