Very handsome A.W. Brill holster! From what I remember from posts by Red there may have been some overlap with Charles W. Kluge and N.J. Rabensburg. We can speculate that they were both in the shop in the late twenties, early thirties.
Another identifying feature found on the Kluge built holsters was his use of single thick piece of leather in the welt.
Rabensburg used several pieces skived down to make the welt.
I can certainly see influences from both of these craftsmen in your holster.
If I found the correct obituary Charles W. Kluge was born August 1862 and passed January 1944.