Good pocket chronometer movement from this interesting firm, circa 1825.
20-size Lancashire fullplate fusee movement with nicely engraved cock, with cap jewels on balance (diamond) and escape. Spring-detent escapement. Earnshaw-type compensation balance with additional screws at the free end. Free-sprung spiral balance-spring. One-piece signed enamel dial. Later hands. 47 mm diameter, 14.5 mm deep, not including centre arbor
Peter Grimalde, 431 Strand, London, a chronometer and watchmaker of repute (Baillie), formed a partnership with Johnson sometime before 1810, this movement post-dating the partnership
Dial with edge crack, near 10, and lacking minute hand. Otherwise in good original if rather dusty condition. Not cleaned by me but ticking with a bright action when wound, even without oil.
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