Swiss two-colour gold chronometer with Breguet fob Circa 1946

Gold lever for Besançon Observatory Timing Contest by Breguet
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A fine Swiss 18-carat white and yellow gold keyless lever pocket chronometer for Besançon Observatory Timing Contest with the original 18-carat white and yellow gold Breguet fob, circa 1946. Sold to Jean-Bernard Ostermeyer in 1946. Movement with matte grey bridges, 17 jewels, stamped with the Besançon viper’s head mark, straight-line lever escapement, Guillaume balance, blued steel Breguet balance spring, index regulator. White gold hinged cuvette with engraved inscription. Silver engine-turned dial with Roman numerals on a brushed reserve, outer dot minute divisions, subsidiary dial for the seconds and original blued steel Breguet hands. Polished case, white gold with yellow gold rims and bow, coin-edge band. Dial signed, case numbered. Accompanied by the original Breguet morocco fitted box and the original Breguet morocco fitted box for the fob.
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Diameter: 44 mm
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Signed: Breguet
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The punch mark in the form of a viper’s head is applied by the Observatory of Besançon on watches that were successful at the timing contest and received the Bulletin de Première Classe.