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The seller added a bunch more photos, and it's clear that "this is what it is" -- an unused (or very lightly used) Model 510 Kirby.
The bag is magnificent!
In a better photo of the hose, we can see that it is dark and non-faded.
The light brown, striped packaging paper is original and authentic.
Look at the brand-new cord! It's incredible!!
The serial number on the motor plate and the large shipping carton (apparently only a piece of which survived) match.
I remember seeing quite a few of these machines when I was a little boy. It's a rare gem that I sure wish I could afford.