I have what I believe to be a Sterling Silver Snuff Box with a Dutch Mark? It is a lion with a key. It also has 2 other marks. One mark is either a cursive W or M in a circle and the other mark looks like it is a MA. Snuff box has 2 different scenes the one shown is the back with the mark of the lion.
http://d.imagehost.org/0359/1-snuff_box_6.jpg
http://d.imagehost.org/0266/1-snuff_box_5.jpg
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