Good lever movement with Earnshaw balance, circa 1830.
Fullplate fusee movement with cap jewels on balance (diamond) and escape. Single-roller detached lever escapement with steel pallets mounted on a gilt brass lever - an unusual arrangement used by this important firm. Compensation balance of typical early Earnshaw form, with wedge-shaped weights held by a screw on the inside and short bimetallic arms having a noticeably 'wide' gap, spiral blued-steel balance-spring. Enamel dial, gilt hands. 40 mm diameter, 11.5 mm deep, not including centre arbor.
Thomas Earnshaw, father and son (the father died in 1829) famous watch and chronometer makers, inventor of the modern bimetallic balance in which brass and steel are fused together in manufacture, rather than riveted or soldered. NB: The firm started to fit and sell lever escapements in the 1820's, some of which have been wrongly recorded as conversions.
Miss-matched hands, the dial with the usual hair cracks and an edge chip, otherwise complete and in good original condition. Not cleaned by me but will tick if wound.
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