www.925-1000.com

I am not sure this will work, my first post. Mark is unknown to me, box is 6 x 4 x 1 inch

Hi and welcome to the forum.

Your image posting doesn't seem to have worked, possibly because of an unsuitable image hosting site. https://postimages.org is recommended (click 'Share', then copy and paste the 'Hotlink for forums' code to embed your images).

Phil

Thanks, Phil

Hi,
The maker is the firm of B.Neresheimer and Sons, Hanau, Germany.
See here:
https://www.925-1000.com/Fgerman_hanau_marks_01.html

Those are pseudo marks (Augsburg acorn,crowned letter pseudo Paris mark) used on remake or fantasy pieces of old silver.
Although there is 13 Loth old German standard, the box was made in the last decade of 19th century, or even later.
Regards

Thanks so much!

Does the mark indicate if this is this real silver and the %?

13 (Loth) means .812 (i.e. 81,2 %), i.e. solid silver.
13 Loth was common standard in German speaking countries. Neresheimer is a reliable maker, so there is no doubt about the fineness.
Regards

Thanks!