I can take photo's if anyone is interested..........Donnie
Of course I would like to see them
Here is a picture of the brass one that I have and also restored some time ago. It is marked with K1V106962 but I can make no sense if these letters not even with Petes decoding help. I will keep trying though! I believe that this one is a bit older. It is stamped with "U.S." at the back.

Many American Lock bodies are stamped with a date code to indicate when the lock body was made: Z=Jan, Y=Feb, X=Mar, W=Apr, V=May, U=June, T=Jul, S=Aug, R=Sept, Q=Oct, P=Nov, O=Dec;
N=1, M=2, L=3, K=4, J=5, I=6, H=7, G=8, F=9, E=0. Thus X H J x = March 1975, disregard the last character.
Thank you for that information Pete! I do not see any marks on mine though... too bad