So we brought it home, even though Joe remained skeptical. First, I used a damp rag to rub off the dirt marks, which worked wonders - it came off and even make the paint wet again, so it looked like an original brushstroke. Then, I used some brown paint we had laying around to paint the frame. What a transformation!
Now it's hung proudly on the wall and completely complements the room - with the greens, blues and browns - it's the perfect fit. I'm not sure I'll even need to look for a replacement any time soon. What do you think?
P.S. It's signed by a Hendrickson, dated 1965 - it's like a little piece of history! Fun, huh?