Swiss 18 carat gold open faced split chronograph Circa 1925

A Swiss gold open faced keyless split chronograph pocket watch, circa 1925. Sold in november 1925 to S.A. Ateliers Aviation Louis Breguet for 3150 Francs. Highly jewelled movement, lever escapement. White enamel dial, Breguet numerals, gold hands, blued steel split chronograph hand, subsidiary dials for constant seconds and 30 minute register and outer track with fifths of a second chronograph divisions. 18 Carat polished case with concealed hinge, case back engraved with the family crest of the Buor de Lavoy family, Poitou (France). Dial and cuvette signed and numbered, case numbered.
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