What ever the load will bear. Looks like a nice gun, all engraved up like that changes the value but I would bet not as much as it would cost to get the work done. I would guess look up the value of the model as a unmolested, then add half the cost of engraving and call it close? Just a guess, $500.00 plus, but that is a guess, it might be much higher but then you have to find someone who it appeals to and is willing to pay for it. SN