I had a quick look around, but I've never heard of them. I am aware of Bill Paige who left Gibson to form heritage. I've no idea if he's still at heritage or not, but I'd say it's up to the seller to prove the origin of the guitar. If it truly was handbuilt by
the Bill Paige, then I'd say it's a no brainer at that price, but I'm inclined to believe that it's an "own brand" made in China guitar that someone is talking up. I could be wrong as I've never heard of these guitars, but without proof, I wouldn't trust anything an ebay seller says.
I do find it odd that a "handbuilt "prototype*"" is left handed. I've no idea if Bill Paige himself is a lefty, but I know that I've seen many more cheap copies being passed off as a "prototype" than I've seen of actual left handed prototypes.
The buy it now price is setting off alarm bells left, right and centre right now. That's a seriously low price. I have a friend who is a luthier and he makes handbuilt guitars (mostly les paul replicas) from scratch with hand tools only. Despite the fact that he is a virtual unknown in the guitar world, his guitars have gone for much, much more than that.
TL;DR? Smells fishy.
Edit: Just found
this. From the short bio, there is nothing to suggest that Bill Paige was actually involved in the manufacturing process at Gibson or Heritage. I'm now 99% convinced that this seller has found himself in possession of a no name PRS copy and has just looked for the name of someone important in the guitar industry with the name "Paige" to push up the value.
* I can't tell you how many times I've seen knockoffs or no names for sale with the word "prototype" in the advert. While genuine prototypes from legitimate companies do pop up from time to time, the word prototype usually sets alarm bells ringing. Especially when it is associated with a guitar company that no one has ever heard of or a popular model. For example, someone once tried to pass this travesty off as a 1951 les paul prototype.
As a die hard les paul fan, this one is pure comedy gold.