Set trigger, 2-step barrel, wedge rear sight, ring finger bow on the trigger guard.
That thing is bananas! Please tell us more, and post several more pics. I'd really like to see the action open, with a good pic of the inside of the hinge area, if possible.
It has a cocked indicator, adjustable rear sight and scroll engraving , perfect bore The long sight radius and extension style grip sure helps my old eyes focus!