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No idea on the artist but the "product mark" on the canvas is for the A. Schutzmann company and "Viktoria Maltuch" was a trade name for the type of canvas they sold. It was widely used by amateurs and professionals alike, both across Europe and beyond. Their factory was bombed out during WWII and rebuilt after the war in Herrsching, southwest of Munich. Since your stamp is for Herrsching, the painting will be post-war and likely no earlier than the 1950s.