Help identifying Hallmark of a cup

[Aguest]

I have a silver cup.
Marked 950 and also another mark. I think it’s from Belgium.
Any clue who the makers mark is?
Thank you!

[Bartholomew]

A835, crowned “R” and two towers - that’s what I see.

I need more photos of item.

Belgian Silver and Jewellery Trade Information - www.925-1000.com