I wanted to add this post to Stephan's line to make sure it's all in one place:
For those who have not seen Stephen Nash's article in Diggory's on-line Doublegunjournal, here it is and it is an excellent example of digestible scholarship:
https://www.vintageguns.co.uk/magazine/lefaucheux-lang-and-beringer-Then add this which might help a bit:
Reilly 10024 is perhaps the earliest datable UK made center-break pin-fire still in existence. According to the Reilly dating chart it would have been numbered in fall 1856, within a month of Reilly first beginning to advertise pin-fires. It is a single bite - with no Beringer rising stud on the water table. Do not know what the screw in the action flat is for but it seems to match a slight impression on the barrel flats.
![[Linked Image from jpgbox.com]](https://www.jpgbox.com/jpg/75696_800x600.jpg)
Reilly 10456 is the next Reilly pin-fire with pictures of the water table. It would have been numbered circa December 1857 and clearly has the Beringer rising stud. Based on subsequent drawings of Reilly guns it is likely all follow-on Reilly's and possibly the two or three earlier extant ones followed the Beringer model.
![[Linked Image from jpgbox.com]](https://www.jpgbox.com/jpg/75697_800x600.jpg)