Great job, fetching that one home to your collection. It's good to see it go to a fellow Forum member. When it arrives please post some photos of it with your pistolas in it.
Brill holsters are pretty enchanting. Early or late eras, they work so well for the purpose and were uniformly good looking too.
I think Red would say this is a later one. It fits the 4 3/4-inch Colt Single Action Army. The 1905 vintage Colt .38-40 is a few decades older than this holster. Still, the revolver snuggles into the holster so cozily yet firmly, while the draw is so natural and easy from the holster. It's certain that some intelligent thought went into the designs as well as some skill in the fabrication of Brill holsters, no matter what they were designed to fit.