JUst to give you a start with responses, I would say you definitly have something wrong with your horn ring. Sorry, I can't tell you more without doing some investigation.
The plasitic container is not original. In those days, they just dripped on the road. The addition of the container is an indication that someone has had cooling problems. In classic cars, I choose "diesel engine antifreeze" It used to be all that was available, but not as diesel.
You are probably going to have to pull the rear panel covers off to expose the window mechanics and see what is siezed up. Probably a little penetrating oil will solve it, (hopefully).
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