Is it possible to tell from this picture approximately what the value is. It's a Colt Police Positive in .22LR. It's very well worn. If it had bluing , it's gone. Same with the checkering, very well worn. Just curious. It came from my grandfather so it's true value is there. It looks like the serial number is 33204 if that helps. Seems low to me but it's the only number I can find on it.