Hey Guy -
What you have is the second variation of the first Eureka Roto-matic. The first had screw-type latch openings on the lid; yours has the clamping latches.
Those are the original bare floor and rug nozzle and dusting brush, but that hose is probably not original. They were very popular machines, very heavily advertised in national magazines like Life, Look, Saturday Evening Post. Kenny is right - they also came in green, and, I think later, when they were redesigned, they got bigger and more powerful.
Awhile back, someone posted some info about this and later models. Congrats - that should be a nice addition for your collection. John L.