signed 1930s vintage original oil painting on canvas, castle towers on river, Scotland?

Original oil on canvas, signed H Dieterich, dated 1933. This piece came out of an estate, and we don't know a lot about it - we don't know where this landscape is, but we think it looks like Scotland!

This measures 36" x 18" overall. It shows a little wear and soil - we haven't touched it, but have left it just as found.