Swiss 18K rose gold lever chronograph with linear calendar Circa 1890

Rose gold astronomical watch with chronograph
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An impressive Swiss 18 carat rose gold hunting cased astronomical chronograph lever pocket watch with moon phases and linear calendar, circa 1890. Glazed movement, a very fine caliber probably by Audemars, an anker chronometer escapement and wolf’s toothing. White enamel dial with Roman hours, an outer minute track and Arabic five minute numerals, outermost fifth of a second divisions, an aperture for the linear perpetual calendar at 12, subsidiary seconds with concentric moon phases at 6 o’clock and decorative hands. The plain case with a monogram on the front. Case numbered.
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Diameter: 56 mm
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Weight: 144 g
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Signed: No name
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The linear digital calendar or so-called American (perpetual) calendar is a calendar in which the date is displayed in a single linear aperture, allowing for a legible dial to be read at a glance. This type of display was invented in the early Art Deco period and is most often found in watches destined for the Anglo-American market. This kind of calendar became popular once again after the Second World War.