Nice finds,the older ones with the metal base and any Eureka F&G uprights are really rare around here,I have that same ESP and was suprised to see a 99 date stamp on the bottom, That 6.5 Vibragroomer II does a great job. I fixed my Filter Queen Model 31x thanks to your archived thread on wiring, I had the same problem,the cord was off and couldn't remember what wires it attached to. Thank You