A one-month duration hermetically sealed mahogany longcase regulator by Thomas Earnshaw and later signed Redfearn, London, circa 1795.

The distinctively shaped movement with angled buttresses, giving extra stability to the movement, and chamfered corners to the plates which are united by curved and flanged pillars secured to the frontplate by steel screws and brass washers. The rear pivot holes are protected by two screwed dust plates. The five-wheel train is driven by a cylindrical brass covered lead weight with brass pulley suspended on a double line running on a turned barrel with conventional stop work and Harrison’s maintaining power. The wheels all have four curved crossings except for the delicate brass escape wheel which is double screwed to its collet and has five straight crossings. The dead-beat escapement is fully jewelled and has beat adjusting screws to the top of the crutch piece. The temperature compensated zinc and steel grid-iron pendulum is suspended from a substantial suspension block mounted to the backplate.

The 11 inch silvered dial, with engraved outer minute circle, encloses the large seconds subsidiary with observatory marks and a smaller twelve hour subsidiary. The counterpoised hour hand runs anti-clockwise, a feature peculiar to Earnshaw’s work, a simplified motion work requiring only one wheel engaging with the cannon pinion. The back of the dial bears hammer marks where the original signature was removed to be re-signed for Redfearn of London.
The richly figured mahogany case has a triple moulded cornice over stop fluted canted corners with moulded panels to each side of the glazed aperture with cover to the winding hole. A triple moulding running along the lower front, sides, side uprights and top of the hood which is secured to the backboard by means of fourteen lacquered brass hand screws. The hood is further fixed to the trunk of the case by eleven hand screws fitted through the throat moulding. The glazed door is secured by twelve brass hand screws and reveals the pendulum and mirrored backboard. The rectangular base has a raised moulded panel and double plinth.