French gold hunting cased keyless lever pocket watch Circa 1880

Gold watch made for Tiffany & Co
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A very fine and unusual French 18K yellow gold hunting cased double train keyless lever pocket watch with stop-feature, circa 1880. Retailed by Tiffany & Co, New York. A solid, engine-turned case, hinged gold cuvette. White enamel dial with radial Roman numerals, outer minute track, outermost 1/5th seconds timing divisions, sunk independent centre seconds with quarter-second foudroyante for the diablotine and blued steel Breguet hands.
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A nickel-silver movement, Geneva striping decoration, double train with differential winding and gold wheels, 32 jewels, straight-line counterpoised and calibrated lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, independent train with push button on the band to stop the centre seconds and diablotine hands. Cuvette signed and numbered.
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Diameter: 53 mm
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Signed: Poitevin Paris
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The feature known as a diablotine is a small subsidiary dial on a chronograph or independent centre seconds pocket watch, the hand of which moves in a jumping manner at intervals of 1/4 or 1/5th of a second. The term literally means ‘little devil’. The diablotine is halted when the chronograph or centre seconds is stopped and the fractions of a second can be read.