Logan, that is a beautiful machine you have. Something I find interesting is that the color scheme and graphics on it match those of an earlier generation early 1980's Kenmore 4.1 I inherited from my parents, one of the earlier boxy models that uses the Type E bag (5023 or 5033) and that impossible to find bag adapter and with the "Tool Garden" that snaps on the top of the bag compartment lid. Cream colored plastic, brown trim and red and brown graphics. I have the 4.1 version of your machine with a push button to retract the cord and lid over the tool tray. It is a sober gray with gray trim and slightly darker gray graphics, almost like a low-vis military paint scheme on a modern fighter aircraft!
Also your Powermate is very nearly exactly the same Powermate as the one that came with the aforementioned older 4.1, differing only in that your Powermate doesn't have a headlight, and yours has a lot fewer battle scars than mine (my mom wasn't thinking preserving it as a collectable when she rammed it under furniture and banged it against baseboards to clean!). Same color and graphics as mine. You can rebuild that thing indefinitely. All the guts remain in production for half a dozen different power mates. Under the skin it's part for part identical to a Hayden Superpack.
I don't see a cord retract button so does yours have the pull to retract cord like my older 4.1 and similar previous generation boxy 3.9 do? These seem to be a transition model from the old boxy Kenmores of the '70's and '80's to the Whimpertones, kind of a best of both worlds with a modern shape, bags and filters you can still buy easily yet they have the good plastics and Ametek-Lamb motors that made old Kenmores so durable and worth the cost.
Very nice vaccum. Sure wish I could find some literature on them.