German gold double chronograph pocket watch Circa 1905

Gold hunter with 1st Quality movement
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An extremely rare German, 18 carat pink gold hunting cased keyless pocket watch, circa 1905. With 1st Quality movement with Lage’s Guillaume type balance, Lange double chronograph system with single push piece for all four functions via one column wheel.
A massive, solid, polished case, chronograph button at 6 governs all four functions and a hinged gold cuvette. White enamel dial with Arabic numerals, outer minute divisions concentric with fifths of second chronograph divisions, outermost red Arabic five second numerals, subsidiary seconds and 30 minute register.
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Louis XV gold hour and minute hands, blued steel chronograph hands. Matte gilt, 1st Quality movement, 21 jewels in screwed gold chatons, straight line lever escapement with a gold fork and escape wheel, Lange bimetallic compensation balance cut in the manner of Guillaume, gold temperature adjustment screws, blued steel Breguet balance spring with a terminal curve, foliate engraved cock, diamond endstone, swan-neck micrometre regulator, visible mechanism for the four-function chronograph. Dial, case and cuvette signed, movement numbered.
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Diameter: 55 mm
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Signed: A. Lange & Söhne  Glashütte B/Dresden
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Lange Double Chronograph system with single push piece Lange & Söhne is one of the few manufacturers to have produced a double chronograph with a single push piece governing all four functions via one column wheel. The first pressure starts both hands together, the second stops the flyback, the third stops the chronograph hand and the fourth zeroes them together. The stopping and zeroing of the hands are by the callipers used in all split seconds chronographs. However, unlike the usual split seconds chronograph, the double chronograph cannot take intermediary times.