Welcome to the forums from the Wiregrass! It is a .32-20 Military & Police revolver that was likely made in the 1920's but may have been retained in inventory until 1940. These were not strong sellers for S&W and you should think twice before buying it. There are much better options for a first time S&W revolver. Ammo will be hard to find and expensive if you can find it. If you can post pictures, that will help us help you. If it is in awesome condition, and cheap, it might still be a good buy.