the middle mark is indeed the mark of Hamburg. ItÂ´s the three tower
and gate mark but heÂ´s a bit messed up ;)
The first mark is the mark of France that the object is imported to France from another country. ItÂ´s a guarantee mark that the object really is made of silver.
The third mark is the makers mark, but I donÂ´t know who the mark belongs to. sorry.