Danish 18K yellow gold hunting cased keyless watch Circa 1865

Gold lever pocket watch by Jules Jürgensen 
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A very fine and rare Danish, 18K yellow gold hunting cased pocket watch, circa 1865. Accompanied by the original fitted box, certificate and key. Patent Lever Watch by Jules Jürgensen, Copenhagen, made in Switzerland, was sold on August 7, 1865. A heavy case, polished bezel, reeded band, engine-turned case back, hinged gold cuvette. White enamel dial with narrow radial Roman numerals, outer minute ring, sunk subsidiary seconds dial. Blued steel Breguet hands.
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A nickel-plated movement, bridge calibre, 19 jewels, escape wheel and pallet fork jewels with gold caps, straight-line counterpoised long lever escapement, cut bimetallic compensation balance with gold screws. Blued steel Breguet balance spring, index regulator with main divisions set on the centre bridge. Dial, case and movement signed.
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Diameter: 50 mm
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Signed: Jules Jürgensen  Copenhagen
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Jürgensen’s patent lever escapement features a long fork that allows the use of a large balance wheel, allowing a more constant rate of oscillation and therefore greater precision.