English 18K gold half hunting cased pocket watch Circa 1872

Gold observatory pocket watch
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Very heavy, English observatory watch with stoppable centre seconds by royal chronometer maker J. Hargreaves, circa 1872.
An 18K gold case, English hallmark 1872, rare half hunting case, a lateral lever for stopping centre seconds, matching number on the case and movement,  precision movement with screwed gold chatons, lever escapement, signed enamel dial, golden hands, in working order, good condition of preservation, minimal imperfections on the edge of back cover.
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Diameter: 55 mm
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Weight: 145 g
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Signed:  J. Hargreaves   Liverpool