identification - can you read this stamp?

[Radomir Polivka]

Dear friends, Dear Ken,

I was offered to buy the following bass. I have not seen it yet, only the pictures. Before I spend the time to travel to see it, I would appreciate to know your opinion about its origin. The name on the stamp (Rysszo?) does not ring any bell. It sounds Hungarian to me, while seller says German, 80 years.

The wood on the top plate seems sparse (not dense enough) to me.

Many thanks.