Happy to oblige...
Per your request, below are pictures of (L to R) a PN2, PN4 and PN4A in Silverado gray. It's easy to mistake the PN4 for a PN2, especially with the polished aluminum cover, but if you compare the PN2 and PN4, you'll notice the elbow where the wand connects is set further forward on the PN2 while the PN4 and 4A have the elbow slightly protruding from the rear of the nozzle's body. Looking underneath, the PN2 has three cylindrical rollers while the PN4 and PN4A have two wheels, one on either side of the elbow. Other than cosmetic features, the PN4 and PN4A are pretty much identical except for the motor hump, which only extends about 3/4 of the way across the cover on the 4A. The 4A also has a slightly longer elbow and lacks the metal ring at the top. The PN4A also has a painted cover, either brown for the Olympia or gray for the Silverado. This is unfortunate because the 'battle scars' show a lot worse on the painted covers, especially the brown ones. In that respect, you're lucky that yours has the polished aluminum cover, even if it isn't original to that power nozzle.
The PN2 always had a white bumper and originally had a teal elbow. That version was paired with the Model G (I think), 1205 and Golden Jubilee models. The Jubilee version came with a 50th anniversary decal. The ones with a white elbow like mine would have been paired with either a Golden Jubilee or a Super J. The PN4 with the polished aluminum cover was paired with the later Super J's and early Olympias before they began painting the covers brown (big mistake, IMO). They transitioned to the PN4A during the Olympia era but the plastics were off white. The Silverado got the gray plastics to match those on the vacuum cleaner itself.
Please understand I was not running down your machine in any way. I was just pointing out an unusual characteristic of your power nozzle, which happens to be a 'plus' in my book. I strongly prefer the look of the polished cover. A few years ago, I tried to strip the paint off of a PN4A cover with the idea of polishing it up but I never could get the paint completely off, except for the 'Electrolux' nameplate area. I finally gave up and repainted it with Rustoleum Hammertone Black paint and primer in one, the color of which is really more of a gunmetal gray. Just for fun, I polished up that nameplate area and masked it off before I painted the cover. The color is slightly darker than the original and the textured paint hid a world of sins. The polished nameplate really made the whole thing pop. They should have done them that way at the factory. I've been very tempted to give the PN4A in the pictures the same treatment, although if a polished PN4 cover were to come my way for a reasonable price, I'd slap it on there in a heartbeat.
