Hi Cerjak!
First of all.......my congratulations!!! What a wonderful - and super interesting - addition to your collection. WOW !!!

Nice photos too. A couple of questions:
1. Does the lock function as a "snapping" type similar to a Japanese matchlock ? I can see where part of the serpentine pushes the pan cover forward upon release.
2. Does the trigger pull backward to release as normal? Or does it push forward to release?
Thanks so much for Posting.
Rick.