I found a vacuum shop a few months ago a Kirby Prototype. It has a Heritage 2 cloth bag, with a transparent G series mini-emptor. It has a Heritage 2 power head and brush roll, but a G series like main body and it is self propelled, but kinda quirky like a G3. There are no stickers of any kind on it at all, in fact the only thing that says Kirby is the bag. On the bottom of it are an hour meter and another meter that measure how many passes you make. There is no light at all and no hood either, but a molded plastic piece that clips in the whole where the hood would be. I got it at a vacuum shop I frequent where a lady had traded it in with another just like it. She said she pulled them out of a dumpster behind the Kirby Factory in the late 80's and traded in both of them for a Simplicity 7 series.
I had to put new wheels on it and adjust the Tech-Drive, but it works and cleans as good as any Generation.
When I was a kid, there was this cartoon show called Prometheus and Bob. Prometheus was an alien who repeatedly tried, to no avail, to teach Bob, a human, how to do various things. Since it is so strange in comparison to other Kirbys, I have named it Prometheus and it is my single favorite Kirby.