4 pin bridle, rebounding lock. That's a best Stanton all right.
JD Dougall was a great inventor and gunmaker.
He was instrumental in popularizing the centre fire, break open gun.
And of course, he had his slide and tilt patent.
His books are certainly worth a read as well.
I own a very similar gun #3284 ca 1874.
It was made in Scotland for a murky individual in St Louis, MO, went to Texas, then Paris, and is now in California. That's quite a trip.
Dougall would advertise the grade on some of his guns. The one I have is graded "Highest quality" on the action, barrels, etc.
I'll post pics when I can.
Best regards,
WC-
