Heavy Swiss silver anchor chronometer watch Circa 1910

Pocket watch by Georges Favre Jacot & Cie / Hermann Roost / Zenith
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Heavy Swiss silver open faced anchor chronometer watch, so-called Chronomètre Superior, with wooden box, circa 1910.
Split 3/4 plate movement, calibre 20 ½’ superior, Pat. 30751 Oct. 18, 1904, Brevet 27541, screw compensation balance, eccentric fine adjustment. Enamel dial with luminous Roman numerals, outer minute track, subsidiary dial for the seconds, and luminous hands. Polished silver case. Dial, case and movement signed.
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Diameter: 56 mm
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Weight: 151 g
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Signed: Chronomètre Zenith
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This wonderful precision watch is shown 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.