English gold lever with Bonniksen 52½ minute carrousel Circa 1911

Gold keyless lever by Bahne Bonniksen
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A very fine and extremely rare English, 18 Carat yellow gold, keyless pocket watch, circa 1911. With Bonniksen’s patented 52 1/2 minute carrousel regulator and Guillaume balance. Retailed by J. Henry Hobbins, Manchester. The case with London hallmarks for 1911 – 1912. A polished case with a master mark (FT). Hinged gold cuvette.
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White enamel dial, radial Roman numerals, outer minute track, subsidiary seconds. Blued steel poire hands. A gilt, half plate movement with spotted decoration, ring turned pillars, spring barrel, lateral lever escapement, Anibal brass Guillaume balance with winged arms, gold and platinum temperature and meantime adjustment screws, blued steel Breguet balance spring, diamond end stone, index regulator, whole on Bonniksen 52 1/2 minute Karrusel.
Dial signed by the retailer, Bonniksen patent mark on the pillar plate.
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Diameter: 52,5 mm
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Signed: Bahne Bonniksen