Decades ago American Rfileman had a photo spread of various 1911s including a left handed one from MS Safariiarms which has purchased its tooling from Randall when that folded. I checked the serial #. Mine! On the other hand, they sold me a used gun. Years later I contacted the then editor (M. I.) who told me that had so many that they didn't have time to test them and just did one article to cover them all.
To qualify, here's a flintlock Trade Gun I'm working on. While hard to see in the first image, I decided to put a beavertail/thumb rest right after the lock (and sideplate on the opposite side).
@Kaktus - did you add the roller on for the roller frizzen or did the lock come that way? Jack Brooks had us to that to a lock.