Swiss pink gold anker chronometer with linear calendar Circa 1890

Gold open faced lever pocket watch 
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A fine Swiss anker chronometer with linear triple calendar, circa 1890. The polished case of this watch is made of 18 carat pink gold. It features a high quality anker chronometer movement with a bishop’s crook lever and wolf’s toothing possibly made by Audemars. The white enamel dial is perfectly preserved and has a unique linear triple calendar known as the American perpetual calendar. The dial has Roman radial hours, an outer minutes track with Arabic five minute numerals, a subsidiary dial for the seconds and elegant pink gold hands.
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Diameter: 51.5 mm
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Weight: 101 g
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Signed: No name
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The item appears to be in good condition visually, but it is recommended to perform a thorough cleaning due to the presence of dust and debris. The movement is functioning well and not damaged.
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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.