To tell if a revolver has never been fired can make a difference in resell value of course. It can also tell you that you have a revolver you can shoot. I had a Python that was never fired for sure & made a killing with it,,,, wait that didn't sound right, I sold it for a LOT of LOT of cash this past year. Turned that cash into more revolvers. Did I mention I love revolvers, old ones never fired are better. Or with just a slight turn on the cylinder is ok. The original box & papers is even better, even if it has been fired. I have my own way of checking to see if they are in new condition or like new but would like to hear how you guys decide what you have. One owner is easier of course but how can you tell if you don't know the history?