I have been researching stadium seats for a few years now. I was prompted to look into these in some detail after seeing some inconsistences with how dealers were describing/selling their seats when compared to what my survey of contemporary images and print references indicated. I have posted some excerpts with what I have for Yankee Stadium seats that may be of some interest or help to you given the time frame and portion of the stadium you are interested in.
Dave Grob
DaveGrob1@aol.com