Swiss 18K gold hunting cased astronomical lever Circa 1890

Gold anchor chronometer
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A very fine Swiss 18 carat gold hunting cased astronomical anchor chronometer with full calendar, circa 1890. Bridge movement, key winding and a gold screw compensation balance. White enamel dial with Roman hours, an outer chapter ring with the months of the year, an outermost minute track with Arabic five minute numerals, an aperture displaying the weekdays, a window for the phases of the moon, sunk subsidiary seconds at 4 o’clock, the date at 8 and fleur-de-lys hands. The case is engine turned with an unusual pusher for the moon phase and days of the week, which can be used to correct forwards or backwards using a slider. Cuvette signed, case numbered. Comes with the large original wooden presentation box.
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Diameter: 53 mm
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Weight: 138 g
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Signed: Henry Moser & Co.
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Equation of time. With this complication, the wheel clock becomes a sundial. The wheel clock shows noon exactly every 24 hours. On the other hand, the sundial shows noon when the sun is at its highest point. However, due to the tilt of the Earth’s axis and the eccentricity of the Earth’s orbit, the sun is not always at its highest point at the same time. A clock with an equation of time (also called an equation) shows how big the difference is.