[If I didn't dork it up, this will embiggen. If I did dork it up, "live with it and don't bother me, consider it a part of the challenge," said the grumpy curmudgeon.]You've actually gathered enough info in the comments that it will only take a small epiphany (especially with the blued bits now attached) to determine the identity of this thing.



I have never owned (or even handled) one of these, but the cocking knob is pretty unique.
Tell us more about these things!
A good whatsis, up to the old standards.
Cheers
Cheers