First time I saw (besides a photo) and played with a vac like that was at Dr Edgar P's office in Greenville SC. That was in 83 or 84, Nate the Greats Dad was there too..He liked riding shot gun in Ike M's big ol caar.. It was a pontiac or buick I think.
The Dusty one (of Rug Badger fame) gave me a beater eggzactly like that one a few years ago..