Hi,
Yes,it is solid silver of 13 Loth fineness (.812,5) and the maker is Neresheimer & Sohne,Hanau,Germany.
See here: https://www.925-1000.com/Fgerman_hanau_marks_01.html
The image of the whole item is always helpful;Hanau silversmiths made reproduction silver reminiscent of previous periods (e.g.Renaissance).
Regards
Do not worry;it IS silver.
As I said the fineness is expressed in old German unit Loth (number 13) equaling .812,5.
For example,sterling is .925 meaning 13 Loth or .812,5 has a bit less silver in the alloy, but still SOLID silver.
Regards