Belgian Slate Triple Calendar Mantel Clock, France, c. 1880, 5-in. porcelain Roman numeral dial flanked by Celsius and Fahrenheit thermometers over glazed pendulum aperture, barometer and calendar with month, day, date, moon's age and mean time at noon, eight-day time and strike movement with outside escapement all in a Belgian black slate case, ht. 19 in.
Belgian Slate Triple Calendar Mantel Clock, France, c. 1880, 5-in. porcelain Roman numeral dial flanked by Celsius and Fahrenheit thermometers over glazed pendulum aperture, barometer and calendar with month, day, date, moon's age and mean time at noon, eight-day time and strike movement with outside escapement all in a Belgian black slate case, ht. 19 in.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
