A second vote here for the +-500 range. Given what you say of the grip frame I'd want to be closer to 475 if it was a show or shop find, but coming from the estate of someone I knew in that kind of shape I'd feel pretty ok at 500-525. Depending on how well you knew them you could go up to 550 IMHO w/o skinning yourself in the deal, though it might take a while to get that back if you were to let it go soon. Depends on what your area is like for collector revolvers.
I've had 3 different V-models over the years and enjoyed them all thoroughly, this one looks like a fairly nice example. Good luck!