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.
The Eargesplitten Loudenboomer round - it was designed to break 5000 FPS only to have failed by traveling 4600 FPS with a 50 grain bullet and 105 grains of powder. It is based on the Weatherby Magnum cartridge case, necked down to calibre.
80 raras, lujosas e impresionantes armas de fuego - Parte 1