Search for these particular brands in ebay search:
Audley, Brauer, Heiser, Lawrence, S.D. Myres, Eubanks, among others.
Holsters as we know them for concealed carry didnt start evolving in a big way until the seventies, and many designs common today were born much later. The idea of a holster made to fit a specific belt size, boned to very closely fit specific guns, high rides, pancakes, IWB, one hand reholstering, etc. are mostly newer ideas. Few civilians concealed carried much before the 90's.
Most made prior to 1960 were simpler affairs that fit belts up to 3", rode rather low, and retained the gun by a strap or flap. Some were utilitarian, others quite beautiful. Most were made for open carry by police or sportsmen. The plainclothes police and detectives that carried concealed usually carried snubby revolvers. As a kid, I knew quite a few detectives that worked in the 50's and none carried autos. Some actually carried .32's.
For holsters specific to your movie era, namely snubbies or small automatics in Film Noir movies, you might search Colt Detective Special or Smith and Wesson J frame or maybe the Colt 1903 automatic and look for older holsters made to fit these.
Or, go here to see a sampling:
http://www.vintagegunleather.com/
You might also rent the DVD "M-Squad" series starring Lee Marvin. I believe I read somewhere that he carried two Colt Agents in cross draw holsters. You could also rent some early Dragnet DVD's. I think Sgt Joe Friday carried a Model 36 in a cross draw. Both flash their holsters from time to time in the series.
