A fellow collector emailed me to state that only the Model F had the long single power nozzle cord, but that's not correct. (Indeed, look at the subject auction listing again!)
The very first Model G also had the long single cord that clipped onto the hose with three hard plastic clips. And this was something that was not fixed right away -- I have seen these long power nozzle cords in both gray [earlier] and turquoise [later].
In fact, thinking about this caused me to look at the auction again, and now I wonder if that was truly the case here -- the power nozzle cord has the rubber straps to secure it (permanently) to the hose rather than the slip-off plastic clips. So maybe in this case the PN connector went bad and this was the way the owner "fixed" it.
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Some other early G differences:
The PN port is in the front cover, inset into a cutout in the bottom hinge area, and the front wheels are right behind the front cover instead of set back to make room for the side-mounted PN port.
(Curiously, when Electrolux rebuilt these models they removed that PN port and put a new one on top of the machine, inset into the long strip of chrome trim. I guess it's easier to get to it there. And that's also where it was placed on the late Model F, the first American Electrolux with a power nozzle.)
The early G hose handle had the old-style (AE, F, R etc.) suction bleed valve, gray in color instead of the narrower, ribbed valve that would lock into place.
The power cord was gray rubber and had a Belden plug, with a rubber bumper behind the plug.
The crevice tool was turquoise plastic but the wider shape and size of the older fiber crevice tools instead of the new longer and narrower version that was provided thereafter.
The first G power nozzle did not have a safety reset switch.
The first G still had the F-style TurboTool power attachment. The new and larger "Rug Washer" came out with the newer G.
There may have been other differences as well, but these are the ones that come to mind.
See photos - early and late G instruction manual covers, note the differences; then the b/w photo of the nice lady pulling the cord out of the cord winder; note the plug.