Well it isn't something you routinely see, if that's what you mean.
Hard to tell (from the provided pics) if it's a manufactured or a home-made piece. It looks a bit too polished to be home-made, but the way it's attached to the base looks "make-shift" at best. It would be great to see some better/blown-up photos.
I follow these figural pieces closely, and while similar to the Hartland, it really isn't even close. Not Salvino, not Gartlan, or Danbury Mint, either. So what is it? I don't know... not likely a mass-produced statue. It's even difficult to tell what era it's from. 1950s, '60s, '70s, '80s, or '90s is my educated guess (how's that for pinning it down?)
The fact that Mantle signed it makes it pre-1995. How about some higher-res pics? Also look for any manufacturers markings, probably on the back or bottom.
Keep in mind that rarity doesn't always translate to value, either. I've seen the Salvino signed nameplates sell for more than the complete statues. So I'm just guessing the value here is most attibuted to the autograph itself.