I have a double barrel LC Smith shotgun. On top of the gun t...

I have a double barrel LC Smith shotgun. On top of the gun there's engraving that reads "LC Smith Maker of Baker Gun Syracuse NY Stub Twist". Remove the forstock and there's engraved "D June 1st 1880 and on the wooden forstock there's "1250A" carved into it. 30-in. barrels, but I can't find the gauge anywhere-- appears to be an odd sized shot shell. It does have the ejectors, and to break it down you have to push the front trigger forward (it has the "rabbit ear" twin hammers and double set triggers. What is it worth today? I need help with this one folks!!