Given the condition and costs to ship, probably about right at the gavel price or maybe a little over market after shipping/transfer, but not much. I had an eye on that auction but backed out when it went up given the condition. The grips are excellent, though, and desirable.
But if you try to have another cylinder fitted and the barrel turned back, then you will have done very badly. That is a very pricey conversion and inappropriate for a commemorative firearm, even in average condition like that one.