I had an Enders Special Service 20ga as a teenager. Someone gave it to me as I recall. Might have been another shotgun, but whatever it was an orphan from somewhere.
Needed a lot of work to get it back into shooting shape but it was a good learner project.
I do remember having to (re)caseharden and fit all the lock parts as they were very soft steel.
The extractor was missing too so I made a new one and a rim recess cutter also simply out of need.

Another of Crescent Arms names as pointed out. I had no idea at the time,,wouldn't have cared either.
It was a shotgun that I could work on, it was mine & that's all that mattered.

A rather nice looking SxS,,I used it for more than a few years w/o any problems after the repairs. Used it w/ 60's factory ammo,,the cheap (inexpensive) stuff of the period.
Canuck brand comes to mind at just less than a dollar a box.

I think I was the only one using a SxS and a 20 at that.
A real man of the times used a pump or semi with baby mag 12's.
Oh well,,,