Swiss pocket watch with one-minute tourbillon Circa 1850

Silver skeletonized open faced pocket watch
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A unique skeletonized pocket watch with a one-minute tourbillon, circa 1850
Polished silver case. Enamel dial, with radial Roman hours, outer minute track, auxiliary seconds and Breguet hands. Specially designed bridge movement, keywind, side lever escapement, steel balance, and finest mirror-polished steel tourbillon cage.
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Diameter: 58 mm
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Weight: 143 g
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Signed: No name
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The movement of this very unusual tourbillon is dominated by the tourbillon cage and the barrel they are arranged on one level and connected by a circular bridge.