It’s certainly a Eureka vacuum that is not the norm. Must have been marketed as a low-end, budget model made for Kmart or some other chain. Eureka must have produced a version with a different colour every year: chocolate brown, salmon pink, mint green. I think yours is more of a minty green. It’s unique because it has that retro 1950’s lettering but it’s not from the 1950’s. Probably a good choice for young singles just starting out in their own apartment, or seniors in small apartments needing something simple and small to fit in the bottom of a closet.
You can certainly find matching cream/beige Eureka Williams attachments to go with it. They are easily found on the internet - even New Old Stock Eureka tools in original packaging from old vacuum stores.