A Very Fine Driver!
While this Kirby may not be all-original, at least it's been well-maintained, and whatever has been replaced has been done with Kirby parts.
As we collect, I think it's good to remember that manufacturers change and upgrade parts, and that a lot of really nice vacs have such parts on them. To my way of thinking, that does not mean the machine has been bojacked.
My Lux 1205 has the current grey wand sheath on it, and I have a new Lux hose. Both parts are actually better than the originals they replaced - the wand sheath is much stronger, and the hose is more flexible. And they are genuine Lux/Aerus parts, not aftermarket, so the machine is still all-Lux even if it's not all-original.
Certainly, the woods are full of "reconditioned" machines that have been cheaply spray painted and given a set of fitall tools, and those machines are not usually of much interest. But a good old machine that had an owner who cared enough to get factory parts is not to be sneezed at, even if there are collectors who can spot the difference a mile away.