Repeated capital ``A`` is seen as secondary marks on Vienna silver, often with Diana`s head.
On the other hand, assay Tremolirstich (zig-zag line) was used earler.
Looks like it was repaired with soft lead - tin solder which possibly obscured more marks.
Soft solder is easily scratched with needle tip and can be removed for a professional repair.
Identification based on initials lacking town or national mark is really impossible.