BEAUTIFUL!
Many congratulations, Phillip, on your most beautiful acquisition!
I, too, know the joy of finding one of these vintage Electrolux Power Nozzles in very gently-used condition!
The full-sheath Electrolux PN-1 (prior to 1968, when Sara Lee bought Electrolux) is quite lovely. It seems that what you have here is a late Model G PN-1 (circa 1967), which would have also been contemporaneous with the 1967 Model L. In fact, unless I am mistaken in my somewhat pedestrian knowledge...you may very well have one of the very last PN-1s that were manufactured before the Sara Lee takeover.
At any rate...were I to offer you any suggestions with regard to caring for your Power Nozzle, I'd say to keep it out of direct sunlight (as it's housing is plastic), give it a nice Armor-All treatment every now and again (to keep it shiny), and use it every so often! :-D