This is an antique, German combination gun (according to the OP) that appears to have several gauges of ammo, like a rifle, shotgun, and pistol bullets. The flourish designs on the gun are beautiful as well.
...Save those thumbs & bucks w/ free shipping on this magloader I purchased mine http://www.amazon.com/shops/raeind No more leaving the last round out because it is too hard to get in. And you will load them faster and easier, to maximize your shooting enjoyment. loader does it all easily, painlessly, and perfectly reliably