Im a newbie here but I have just acquired a percussion shotgun that measures 54" overall with 38" barrels. I got this guild gun from an estate and all they could tell me about it was that they got it from New Orleans many years ago.
One mark looks close to a St Etienne mark but not exactly. There are several other marks that I could use some help on as well.
If anyone can fill in the details for me like the date, maker, and what the marks indicate I would greatly appreciate it! Thanks!

Photos here:
Double Percussion https://www.icloud.com/sharedalbum/#B0k5qXGF1678l4