Ok, I asked this question a few years back, but I have a follow on.
On my 1884 TD below the top screw of the butt plate the rifle is marked
2
F
29
Is there a standard marking convention?
Is 29 "29th" regt?
The answer as I remember it, was "no". But based on ID'ed rifles is there some way to make an educated guess (realizing it isn't perfect)?