Very fine German rose gold quality 1A lever watch Circa 1900

Rose gold full hunter by A. Lange & Söhne
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A very fine 18 carat rose gold hunting cased quality 1A Glashütte lever pocket watch, circa 1900. Tested by the German Chronometer Testing Institute of the Leipzig Observatory and the German Seewarte in Hamburg. Sold in 1900 for 515 marks. ¾ Plate movement, a piston tooth lever escapement and gold screw compensation balance. White enamel dial with black Arabic hours, an outer minute track, red Arabic five minute numerals, sunk subsidiary seconds at 6 o’clock and Louis XIV hands. The plain Louis XV case with monogram CW on the front. Dial signed, case and movement signed and numbered, movement and case with matching numbers. Comes with the original certificate.
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Diameter: 53 mm
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Weight: 112 g
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Signed: A. Lange & Söhne Glashütte B/Dresden
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According to Martin Huber’s Long List, this watch was subjected to a special rate test at the Leipzig Observatory and the German Maritime Observatory in Hamburg. It comes from a series of around 1000 watches tested at the Leipzig Observatory between 1883 and 1905, but only about half of them are marked as ‘tested’ in the workbooks.