A black lacquered bracket clock, English, 18th century, with a strike and silent dial escapement to the centre of the dial and calendar aperture to the base, brass dial marker 'Ferdinand Vigne, London', 44 cm high, 25 cm wide and 18 cm deep
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- Date Aperture - A date aperture is a cut out section in the face of a watch or clock, displaying the day of the month.
- Calendar Aperture -
A calendar aperture on a clock refers to a small window on the clock face that displays the day, month or year or all of these. The aperture is usually located on the clock's dial with the date data recorded on a wheel which is designed to rotate to show the correct date information.
Some clocks have a manual adjustment for the date, while others are designed to automatically adjust for the date, including for leap years. The calendar aperture is a useful feature found on clocks from the 16th century, and on many types of clocks, including wall clocks, alarm clocks and wristwatches.
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