chan55, I believe GE sold their vacuum division to Premier in 1972, which I would think was when they ceased production. But the GE canister above from 1983 seems to indicate they must have started making them again... I'm not sure. Someone with more knowledge will hopefully be able to us.
The GE vacuums at Walmart were indeed Eureka. Walmart has an exclusive right on GE housewares and small appliances. They are made by other companies and labeled with the GE logo which is licensed to Walmart, and on the bottom have "Walmart Stores, Inc. Bentonville Arkansas".
GE sold their own housewares line to Black & Decker in 1984, so I'm pretty sure anything made after then is just a relabel.