Mind my saying, but in my eyes the assayer's initials seems to be AK not AA. That would be Aleksander Krollau in Vilna 1891-1899. In my records Artsibaschev was in Moscow in 1895.
Qrt.S, you are absolutely right - this is Krollau. Unfortunately assay mark is poorly readable, and my eyes are no longer perfect ...
And my second mistake - the name of Artsybashev is Anatoliy (Анатолий) but not Alexander.
Dear Qrt.s!
I was just courious, because today made the photos of the mark, and I wanted to know the makers, but I didn find it.
So thank you for your answer.
Best regards!
Krisztián