Swiss 18 carat rose gold complicated astronomical watch Circa 1885

Rose gold lever with linear calendar and moon phase
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A complicated astronomical pocket watch with linear calendar and moon phase made in Switzerland, circa 1885. The open faced plain case of this watch is crafted from 18 carat rose gold and its cuvette is engraved Pietro Rossi RU.NO 15 Octobre 1887. The white enamel dial has Roman hour numerals, an outer minute track with Arabic five minutes, a subsidiary seconds dial with concentric moon phase at 6, a linear full calendar, the so-called American perpetual calendar, below 12 o’clock and decorative rose gold hands. The movement has a very fine anker chronometer with wolf’s teeth and a large chronometer balance.
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Diameter: 50 mm
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Weight: 98 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.