I've had a couple. IMO that gun, assuming it is about the same on the other side is a 50% finish gun. I wouldn't say it would bring $300 though. I'd guess the lowest estimation would about top it out. Merwins are all that has been said about them. Trouble is, the large frames seem to bring money all out of proportion to the small ones. This is probably the large frames are the ones most folks associate with the old west, whether that is accurate or not.