Yes, the mark is well struck and it`s not faked. Besides, it makes no sense to fake it.
Completely forgot this, read my post
http://www.925-1000.com/forum/viewtopic.php?f=8&t=43226
Your box was imported to Bolzano, now in Italy (South Tyrol). Its name in German is Bozen and it belonged to Austria – Hungary Empire at the time. Letter
I is definitively for Bolzano because the items I took pictures of have engraved inscription ``Bozen``.
Do not be surprised silver from Birmingham was imported to Austria. Bolzano is an important tourist destination. Besides, Italy is full of imported British silver.
Mystery solved.
Regards