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|Description||Perpetual calendar of volvelle form, with the outer discs missing. The calendar is made from a French coin that is made of silver. One side of the calendar and outer edge are the original coin, which depicts Louis XVI. The other side has the days of the week in English and dates.|
|Date made||circa 1780|
|Artist/Maker||B Du Viv
|Credit||National Maritime Museum, Greenwich, London, Caird Collection|
|Measurements||Overall: 2 x 40 mm|
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