If you remove the lock and look at the back, it will be stamped Bob Roller. How the stamping is configured will determine when the lock was made. If you show a picture of that stamping, Bob will probably identify it for you.
Slight correction. I sign my locks and triggers "Roller" in a semi circle
and since 1989 with USA in the semi circle. July of 1989 was the last year
I used a year date. Some of them from the late 60's or early 70's may
have a day/month date.With the exception of a few made for a Texas
builder I always put my name INSIDE the lock
Bob Roller