That's a Eureka model 8. Made between 1921 and 1923. The original bag was black, with the word Eureka on it. There will always be some sparking where the carbon brush touches the commutator. Make sure the bearings are oiled. If the fire (sparking) circles the commutator, you have a problem. There are carbon brush seating stones that are small, square, white pieces that look like chalk, you hold them against the running commutator (through the vent holes in the back), and they will reseat the brushes and clean the commutator. The model 9 was virtually identical, but with much simplified wheels on the nozzle. Your model 8 is a very nice example.
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