Swiss ultra thin gold watch with perpetual calendar Circa 1926

Gold watch with perpetual calendar and moon phase by Breguet
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An extremely rare and fine, extra thin keyless winding, Swiss gold dress watch with six horological complications, and extract from the Archives, circa 1926.
Round-shaped 18 Carat yellow gold case with snapon case back. Gilt dial with Breguet numerals, subsidiary seconds at 6, half-instantaneous perpetual calendar, date of the month (subsidiary dial at 3 o’clock), day of the week (subsidiary dial at 9 o’clock), the month of the year (subsidiary dial at 12 o’clock), age and phases of the moon (subsidiary dial, and aperture at 6 o’clock), and a four-year cycle of leap-years (subsidiary dial at 12 o’clock). Ultra thin, rhodium-plated movement with going barrel, straight-line lever escapement, cut compensated balance, and blued steel hairspring with a terminal curve. Case, dial and movement signed. Accompanied by original fitted box and certificate.
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Diameter: 45 mm
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Weight: 49 g
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Signed: Breguet
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The Breguet Certificate n°4 494, dated February 12, 2018, mentioned that this watch was sold on August 30, 1928, to Monsieur Charles Liewer, for the amount of 12 144 Francs.
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According to the Breguet company records, this gold dress watch was created in collaboration with the workshop of R. Cart in Geneva.