I will hedge a guess that it was the early 1980's. That would have been about the time that both Eureka and Hoover began to private lable their powerheads. But for Eureka I would guess the late 1970's.
Reason? Rexair/Rainbow started offering their powerhead in 1976 I believe.
And they private labled for Compact/Revelation, Jc Penney's and Wards. Not all in that order of course.
So I guess my final thought is 1981-82??
