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Hello, the star is not a WMF mark, it must have been added by someone else - possibly a retailer ? I/O means that 1 gramm of fine silver was spread on an aera of 10 x 10 centimetres. Best wishes, Bahner
I might add that I/O is regular silver coating. I agree that the star is not a WMF mark. If it had been, it could cause some confusion, since O is the WMF marking for extra thick coating.
I'm not entirely sure, but I think that the mark on your piece was first used in 1910.