French rare platinum gold watch Montre Simple Circa 1822

Open faced pocket watch with Breguet certificate
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A French rare platinum/pink gold Breguet pocket watch “Montre simple”, sold on June 11th, 1822 to the notary Monsieur Fourchy for 1140 Francs. With Breguet certificate no. 3630.
18 carat pink gold and platinum case, case design “quatre baguettes”, engine-turned. Silver dial, engine-turned centre, auxiliary eccentric seconds between 4 and 5 o’clock, Roman numerals, blued hands. Bridge movement, keywind, shock protection-“parachute”, ruby cylinder escapement, temperature compensated balance spring, three-arm ring balance.
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Diameter: 50 mm
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Weight: 98 g
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Signed: Breguet, Paris, “Horloger de La Marine Royale”
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Antoine-Jules Fourchy (1789-1851) was a well-respected notary in Paris from 1819 until his death in 1851.
Breguet only very rarely produced cases in a combination of platinum and pink gold; platinum was hardly ever used before circa 1800.