Important Swiss gold one minute tourbillon watch Circa 1926

Very fine open faced lever with Guillaume balance by Breguet
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A very fine, rare and important Swiss 18 carat gold open faced keyless one minute tourbillon watch with Guillaume balance, circa 1926. Sold to Monsieur Jean Dollfus on 1st February 1926. Nickel finished fully jewelled lever movement numbered twice, Guillaume balance with gold poising screws, polished steel three armed one minute tourbillon carriage by Pellaton, central jewel carried in gold screwed chaton, blued steel hairspring, glazed dust cover. White enamel dial with Breguet numerals and subsidiary seconds. Plain case. Case numbered, dial and movement signed and numbered. Comes with a Neuchatel Bulletin d’Observatoire, certificate and the original box.
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Diameter: 56 mm
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Signed: Breguet 986
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Jean-Jacques or Jean Dollfus and his brother Louis were descendants of the prominent Dollfus family of industrialists and founders of a textile manufacture specialized in needlework (today DMC Dollfus Mieg & Cie, originally founded in 1746 in Mulhouse, France). Jean was born in Paris in 1884, Louis in 1901, the brothers attended the Ecole Alsacienne in Paris. Both were passionate watch collectors and regular clients of Breguet.