What is this old Double Barrel?

[chains786]

Hello, Thank you for your time for looking at this gun.
It measures 46 3/4 long
There is lots of fine inlays & designs in the metal I was told it was a early 1800 english made.
The left hammer pulls back and releases with the trigger the right one does not....
Any Info,Value would be greatly appreciated! Thank you again
Mike

This is the link to the album with 26 photos http://s559.photobucket.com/albums/ss31/123ezdeals/Double Barrel/

 

[Zonie]

It looks like it has Birmingham proof marks on the barrels.

Probably from the middle of the 19th Century.

In its present condition I would not think it would be worth a great deal.