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There is also a other mark on it. It is very small but I almost for sure know it is the dutch import mark. Used from 1831 til 1893. So it must be older then 1893.
The mark on the left is not Dutch but French. It a boar's head, like the Dutch import mark you are reffering, but its outline is sligthly different. It is the French guarantee mark for 800 silver (see http://www.925-1000.com/Ffrench_marks.html , column on the right)