This is a beautiful perpetual calendar made from brass in a typical Art Nouveau design.
The day of the week, date and month are printed on fabric rollers. These are moved forward by the winders on the right and then backwards by those on the left when the end of the week, month or year are reached.
Who made it and when?
There's no maker's mark; it's simply made with a stamped brass sheet on the front and a brass box behind. We think that the design, construction and ageing suggest that it was made sometime from 1900 until the First World War, when brass shortages may have made manufacture unlikely.
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