Swiss observation chronometer with wooden box Circa 1910

Extremely rare Zenith 20 ½ Superior pocket watch
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An extremely rare observation chronometer 20 ½ Superior with wooden box, made by Zenith in le Locle, Neuchâtel region in Switzerland, circa 1910. The plain open faced case is made from silver and the white enamel dial has luminous Roman numerals, an outer minute track, a subsidiary dial at six o’clock for the seconds and luminous hands. The movement is numbered, has a chronometer calibre of quality 20 ½ Superior with an anchor escapement, 19 jewels and patented fine adjustment.
Dial, dust cover and movement signed and the test/transport case made of wood has green felt inside.
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Diameter: 56.5 mm
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Weight: 152 g
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Signed: Chronomètre, Zenith
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Zenith observation chronometers are rarities, especially in such fantastic condition. This wonderful precision watch is illustrated and described in Manfred Rössler, “Zenith – Präzisionsuhren seit 1865”, Ulm 2008, p. 94.
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Georges Favre Jacot & Cie / Hermann Roost / Zenith
Patent No. 30751 of October 18, 1904, Mécanisme de remontage et de mise à l’heure (winding and time setting mechanism) according to Georges Favre Jacot & Cie. and Patent No. 27541 of January 31, 1904, Raquetterie pour montres (construction of the regulator) according to Hermann Roost, St-Imier.