Exceptional English silver one-minute tourbillon Circa 1900

Silver custom-made tourbillon
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An exceptional, custom-made English silver open faced one-minute tourbillon with a wooden box, circa 1900. Skeletonized movement, filigree tourbillon cage, lever escapement, gold screw compensation balance. The dial with a silvered chapter ring, Roman hours and outer minute dots, subsidiary seconds at 6 o’clock, skeletonized centre. The case is glazed on both sides. Movement numbered.
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Diameter: 57 mm
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Weight: 145 g
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Signed: No name