Trumpet vessel... makers mark?

I have this 830 silver trumpet shaped vase/cup thing. Found at an estate sale for cheap.
Engraved "To Betty from Christine".

Measures 4.25" or 11 cm. The bottom plate is missing, exposing the cement weight.

Can anyone ID the maker? I think from Norway, but not sure. I can't find that mark anywhere.
Any help is appreciated!

 

Nice find, stracci.
It is Norwegian. It could be the mark of Kristian M. Hestenes:

https://www.925-1000.com/Fnorway_marks2.html#1

Tagging @DragonflyWink just to be sure.

 

Thanks AJ!
Somehow I missed it when I searched that site!