Carl,
How about some University Cornerhorns from about 1958, sold back then for $528 per speaker as mono was the only way they came. 15inch woofer,midrange horn,horn tweeter. In my travels when I first toured the country usually on my way home ended up stopping and picking up a speaker that barely fit in the back seat of my father in laws Park Avenue. I ended up collecting 5 of these as I was going to build some kind of home theatre system in my basement. I still use a pair at my office and have another pair in the garage that I use to use while washing the car or doing yardwork. I believe they were model SP6, I have the paperwork somewhere around the house. weigh in at 80lbs or so, the cabinets have been abused, especially the garage speakers but the office ones aren't bad. Have a lone blond cabinet one also.
You want vintage, you got it!