English lever escapement watch of museum quality Circa 1782

Gold open-faced watch with steel escape wheel 
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An early English lever escapement gentleman’s pocket watch of museum quality with steel escape wheel according to Mudge, circa 1782.
18 Carat rose gold case, style of Valentine Walker, polished, á goutte, large lateral hinge, signed and numbered movement protection cap. Regulator dial, enamel, eccentric hour chapter ring with radial Roman numerals, auxiliary seconds, signed, outer minute chapter ring with Arabic numerals, blued hart hands. Full plate movement, keywind, frosted, gilt, signed, chain/fusee with Harrisons maintaining power, round movement pillars, two-arm gilt brass balance with screwed steel ring and patented double S balance with compensating nuts screwed onto threaded posts fixed to the free ends of the S-shaped bimetallic strips, free-sprung blued helical balance spring, Emery style balance bridge with floral engravings, chatoned diamond endstone on balance and escape wheel.
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Diameter: 55 mm
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Weight: 169 g
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Signed: Josiah Emery, London