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maker is unknown because there is no makers mark. The one mark is a tax mark used 1810 to 1824 it looks like an A over TF
the other mark is silver mark. If it is A at top of it - it is Wienna.
the 4 figures is 18X6 for year. In combination with tax mark X must be 1 ie 1816.
The letter on top of this mark look more like H instead of A (wienna) H is Hall (city)