Budweiser Clydesdales with Wagon Painting

I am really curious about this painting. I have never seen another one like it anywhere. We've had it for as long as I can remember. I was told it came from a bar, but I have no idea about the history beyond that. I'd really like to know the history of this painting and if it's anything special or not. Please let me know.

I want to say there is a small signature in the bottom right corner, but I don't want to say for sure. I'm not in the same location as the painting right now to verify it. Also, the condition would be excellent I would assume. It has only hung on the wall, so it has never been abused.