Your weapon is not a flintlock but a percussion cap shotgun rifle made by GG Julcher of Philadelphia PA from c 1840 to the Civil War. It is an unusual weapon as the shotgun lock (Hammer and cap) on the left side is upside down, an extremely clumsy solution as the cap tends to fall off.
To vague a description. Check the auction sites. Broad range 100-400. They were made from 77-81.
Fine
What do you want to know?
no
50-350 USD or so
If it is a Superposed model 1951.
best condition 1000.00$
50-150 USD
1966
Needs to be looked at by a gunsmith
Go to Browning.com and download a manual.
50-100