Do you recognize the accordion manufacturer or the piano player?

The photo with the piano player has been taken in Vyborg at 1890. The accordion player is Martin Paul (1843-1893), originally from Rendsburg (Denmark/Germany) and later moved to Sweden and then finally to Finland. I somehow assume that the accordion could be from St. Petersburg but the manufacturer is unknown.

I would appreciate a lot if you have any ideas about the accordion brand or if you happen to recognize the piano player!