As promised, here are pictures of a gun I inherited from my father years ago.  The information I have about it is limited.  If you can suggest how I can learn more, I’d appreciate it.  My understanding is that my uncle obtained it during WWII in Germany.  I believe it is known as a drilling.  The two top barrels are rifle barrels and the bottom one is a shotgun barrel.  Caliber and gauge are unknown.  Although there is a design on the side, there are no numbers or letters anywhere on it.  Help!

Update:  At the suggestion of Gun Blobber, I ran home and measured the bores.  The rife barrels measure almost exactly 1/2 inch across and the shotgun barrel measures just under 3/4 inch across.  Measurements done with a standard tape measure.

2nd update: It does have some rust spots on it.  If anyone could recommend a gunsmith in the Nashville area to get it  cleaned up, I’d be much obliged.

(Click to embiggen.)