English skeleton timepiece with helical gearing, by C. McDowall, Leeds, No. 391, circa 1840.

English skeleton timepiece with helical gearing, by C. McDowall, Leeds, No. 391, circa 1840.

English skeleton timepiece with helical gearing, by C. McDowall, Leeds, No. 391, circa 1840. This small skeleton clock with glass dome is signed on the dial, technically exceptional with the helical gearing system throughout. Helical gearing meaning having the form of a spiral. 8 day going movement, anchor escapement, chain fusee, brass trapezoidal pendulum with steel spring suspension. Circular silvered dial, roman chapters, outer minute ring, blued hands. HxWxD 31x19x11 cm. Price € 12.000,-- Literature: Derek Roberts: British Skeleton Clocks, pages 170--173. F.B. Royer-Golland: Skeleton Clocks, pages 62-63.