2-day movement, rosewood case with brass mounts
8.6-cm engraved silvered dial with Roman numerals signed Dumas Sr (successeur) de Gannery No. 111, subsidiaries for power reserve and seconds, 56-hour movement with chain and fusee, Earnshaw's detent chronometer escapement and bi-metallic split balance, Harrison's maintaining power, spotted plates signed Dumas No. 111, in a double brass case suspended in gimbals, three tier rosewood box with brass mounts.
Onésime Dumas (1824 - 1889) nephew and student of the famous chronometer maker Henri Motel, he was also student to Perrelet and C.A. Berthoud. He settled in Saint-Nicolas d'Aliermont where he took over the business of Victor Gannery 1851. Tardy, Dictionnaire des Horlogers Français, pp. 204-205, 245
Charles Allix noted in his book that Onésime Dumas was mentioned in 1879 in the revue Chronométrique as the most important chrometer maker of France. Allix/Bonnert, Carriage Clocks pp. 99.
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