Two day chronometer watch with power reserve Circa 1875

Silver open faced chronometer by Dent
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A fine and rare English silver two day open faced pocket chronometer watch with power reserve, circa 1875-1876. Gilt finished 3/4 plate jewelled movement, Earnshaw type detent escapement, bimetallic compensation balance with Mercer’s type H auxiliary, blued steel trio in uno helical spring, freesprung regulator, diamond endstone. Silver cuvette. White enamel dial with Roman numerals, outer railway minute divisions, aperture for 56 hours power reserve and subsidiary seconds. Large plain case, hinged back. Case numbered, stamped with casemaker’s initials ‘JTW’ for James T. White and with London date letter for 1875-1876, dial and movement signed and numbered.
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Diameter: 67.5 mm
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Signed: Dent Watchmaker to the Queen 33 Cockspur Street Charring Cross London To Her Majesty To Him The Emperor of Russia