Swiss 18K gold keyless lever with linear triple calendar Circa 1880

Gold complicated pocket watch                     
–
A very fine and rare Swiss 18 carat gold open faced keyless lever pocket watch with linear triple calendar and moon phases, circa 1880. A polished case with date correctors and hand setting buttons on the band. The hinged gold cuvette engraved with technical details within an engine turned border.
–
White enamel dial with radial Roman hour numerals, outer gold dot minute divisions, subsidiary seconds with concentric moon phases at 6 o’clock, an aperture for the linear days of the week, date and months, fancy gold pierced hands. A rhodium plated movement, Geneva striping decoration, 17 jewels, wolf’s tooth winding, gold wheel train, counterpoised straight line lever escapement, cut bimetallic compensation balance, blued steel balance spring with a terminal curve and an index regulator. Signed LeCoultre on the dial plate.
–
Diameter: 53 mm
–
Signed: LeCoultre Genève
–
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.