Who is the author of this painting?
 

I got from my grandfather this painting, he bought it about 1930 in Moscow. I have no idea who painted it. There is a signature, but not very good to read.

Nachtigaller

There seems and nothing to read.

It feels like a foreigner trying to imitate the signature of the Cyrillic alphabet.

I agree 100%.

Andrei Beloborodov?
(1886-1965)

But it's mostly plot.

i did a fast search on the net and found a signature of Beloborodov, its very different...

Nachtigaller