Link to and album with all the photos.
https://imgur.com/a/T5OntolOverall pic below.
A friend inherited this blunderbuss. We're pretty interested in anything we can learn about it.
We didn't see any markings and he didn't want to try to take the barrel out to look underneath.
The lock is quite unique to me. Both the half cock and fully cocked positions are held in place by pins the protrude through the lock plate. Pulling the trigger makes the pins recede into the lock. The fully cocked sear pin is flat but the half cock pin is cylindrical with a groove that catches and holds the hammer even when the trigger is pulled. From the filly cocked position the hammer tends to bump over the bounded head of the half cock catch pin. It's quite ingenious.
The flare on the muzzle looks to be soldered on though I didn't get a good picture of the solder/weld line.
There also appears to be some sort of patch near the breech block on the left side.
I don't think this lock was ever made as a flint lock. What do you think?