English gold half hunting cased lever with carrousel Circa 1900

Gold keyless half hunter 
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Very fine and rare English 18 carat gold half hunting cased keyless pocket watch with carrousel, circa 1900. Kew Certificate, class A, 82 Marks. Frosted gilt movement, 3/4 plate, 17 jewels, going barrel, lateral lever escapement, freesprung cut bimetallic compensation balance with gold screws, blued steel Breguet balance spring with terminal curve, diamond endstone, all mounted on a Bonniksen 52½ minute carrousel regulator. White enamel dial. Plain case. Case numbered, movement signed and numbered.
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Diameter: 50 mm
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Signed: I.A. & N.C. London
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Carrousel: a revolving escapement that is designed to reduce position errors in a watch and is mounted in a carriage similar to that of a tourbillion but differs from it in its slower speed of rotation and in having the fourth wheel contained inside the carriage.