16 guage

Picked up this gun the other day, can't seem to find anything about it online or any other gun like it. Would like some input on what you guys think this gun is and maybe a value as to how much it's worth. So for this is the information that I have found on the gun: (Right Side of Barrell...

My grandpa got me this shotgun when I was younger. I don't really know anything about it. Single-shot, break action, 16ga What can you guys tell me about it? I believe this reads: PATENTED D DEC.15.91 OCT.2.94 AUG.11.96 AUG.14.00 MAY.27.0 Along the top of the barrel it reads: THE...