Minus the anvil part, I've seen the vise part before. Somewhat similar to a post vise, but without the post. It's pretty weird. The one I seen was pretty big and going fairly cheap. Not sure if they just go cheaply whenever they're out there, or if the guy was selling it fairly cheap. I know nothing about them, but someone should chime in soon that can fill you (and me) in. I'd pick it up just because it's unique! Thanks for sharing!
[EDIT] Didn't see your resell comment. I believe the one similar to this I seen was going for like $80, and it was on CL for ever (several months). For resell, I'd probably only pick it up for under $40-50. Fix it up and I would ask ~$150 just to see if I get a bite. That's just me though.