Swiss repeating watch with American perpetual calendar Circa 1910

Gold lever watch with five complications
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A fine and unusual Swiss open faced minute repeating keyless lever pocket watch, circa 1910-1920. This unusual timepiece has five horological complications: minute repeating on two steel gongs activated by a slide in the band at 3 o’clock and a linear calendar, the so-called American perpetual calendar indicating the date, days of the week and months of the year.
The case is made of 18 carat yellow gold. The dial is white enamel with Arabic hour numerals, an outer minute track, subsidiary seconds at 6 o’clock, a linear calendar at 12 and Breguet hands. The gilded brass movement with a straight line lever escapement, compensated balance with gold poising screws and blued steel hairspring with a terminal curve, an index regulator with swan neck spring, and a micrometric screw.
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Diameter: 53 mm
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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.