From what I can see of the finish, grips or no this gun is not collector grade and hence not top dollar.
The collectors pay the most and it all has to be right. Not necessarily NIB perfect, but a definite step from "shooter grade" which is what this looks like to me.
I am a "shooter grade" kind of guy. I buy classic smiths that are not collector grade but have perfect functionality because they are the best guns/best deal to be had. I shoot them, I use them because there is nothing else available that isn't in some way inferior.
Without seeing the gun personally, I think this gun fits that mold and I would offer/pay accordingly.
Colt inflation right now is off the hook and I am no "seer" of the future. I buy the best revolvers available for use and this could easily be one.
P.S. I got my model 19-3 for 425.00 on gunbroker with better (original) grips and a similar finish. I don't think I got a killer deal, but a fair one.