Welcome to the Forum. There is a whole lot of information missing, but in this case the "C" helps. That 38 Military & Police revolver would likely have shipped from the factory in 1950. There is no way to give you a value on that M&P without seeing it, knowing what condition the finish is in, type of stocks, and if the configuration is original or altered, etc., etc., etc. Pictures would help and you can usually save images and then post them here, but not the link to the gun if for sale online.