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.
Devin Thomas Damascus Custom Spirograph in Wenge Wood. The Damascus steel is beautiful! is the largest blade I've come across yet. is the standard and recommended size, but wider blades supposedly require fewer 'wipes'.