That's no Linebaugh. Dustin is John's son and made John's grips though he himself is a very accomplished gunsmith. I've got a friend that's been waiting ten years for a gun from Dustin. Not me.
That linked Vaquero has a Linebaugh (looking) front sight and a pretty tight BC gap. Plus a grip frame that didn't come on Vaqueros. It's been through someone's hands for some kind of work, but without paperwork it's a hard sell. With paperwork it's priced fair.