Fine Swiss 18K gold double-sided pocket watch Circa 1870

Gold double-sided pocket watch
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A very fine Swiss 18-carat gold, technical rarity, double-sided pocket watch with an unusual 2nd-time zone, interesting anchor chronometer, circa 1870.
Nickel movement, lever escapement, cut bimetallic compensation balance. Engine-turned 18K gold case. Decentralized enamel dial on the front with a normal time display, on the back separately adjustable 2nd-time zone, champlevé numerals, view of the interesting anchor chronometer movement, fine Breguet steel hands, red-gold hands on the front, very rare.
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Diameter: 51 mm
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Weight: 111 g
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Signed: No name