Not vintage, but pretty useful, and easy to find, a Galco horsehide IWB, model L119H UDG 158, fits J frames from this Magnum J frame 2 1/4" bbl 640-1 to the smaller Baby Js (Baby Chiefs):
Nice thing is that it is one of those that you can tuck your shirt over it, and the only thing that shows is the little hook at the bottom of the belt clip.
For older designs, here is a Clark with my snub nose Official Police:
Maker and model:
Best Regards, Les