Not to rain on your parade, guys, but there were many, many guys pounding leather out in the hinter lands. Very able craftsmen, trust me, they are not, except by the very barest possibility S. D. Myers holsters. Some of you guys are missing the point, the guy making it was making it for it's utility, basically, not for it's future worth based on it's "marque".
Like some have said, some did it after hours, between jobs or just didn't have a maker's stamp. If it is a quality item, it is a quality item, it isn't a Rolls Royce that somehow someone left the documentation off of. My first 15-20 years of leather items had no indication of who made them. It had nothing to do with the quality or the usefulness for future generations. I was naïve, and really didn't know any better, or frankly even care.