Stepdad's shotgun...?

[Steven Dennis]

Hi. Just received this from stepdad's estate. Don't know a thing about it and its value. Can you help? It does have matching numbers when it broke it down into three parts. Serial # 16348 which indicated it was manuf in 1879. It is dbl barrel. 26 inches. It does say "Plain Twist" on the barrel. Underside of barrel when separated from stock (I guess the "flats") has an "M" and a "3" with an "8" raised above it to the side like an exponent. It also has the number "6892." It also has the serial number 16348 on opposite side. I don't see any number on the barrel lug. I do see a small "JS" on the forward raised piece in front of the barrel lug? On the watertable, I do see the same serial number followed by the letter "U." The small piece that locks the barrel to the stock also has the same serial number of 16348. The wood piece of that has been cracked and repaired many years ago.

What can you tell me about this guns quality...and, of course, estimated current market price? Any help would be appreciated. Thank you for your time. Steven