GAF Versapan
Interesting thread! Now I'll throw in my 2.1¢ worth; 2.1¢ in Canadian dollars = 2¢ in American dollars.
When I was in junior college, in the Spring of 1972, one of my instructors had been given several 1000-foot rolls of 35mm GAF Versapan motion picture film. Said film had an ASA speed (the forerunner of ISO ratings) of 80 to daylight, 64 to tungsten, and an expiry date of September, 1967 printed on the label.
His students were invited to take a bit of film and try it out. Most students weren't interested, as we were warned that the true speed for and development times were more or less unknown. So, I was able to take a couple hundred feet of film, and it kept me going that year, until I got a summer job and was able to buy a 100-foot roll of Tri-X (selling for about $10 the 100-foot roll back then...).
I exposed the film from between EI 40 to EI 1000, and tried different development times, mostly in D-76 1:1. As might be expected, most negatives were rather thin (rather...), but printable. This was before I discovered the importance of accurately exposing and developing my film, and before I had learned anything about sensitometry. I still have prints I made from that film, and while they tend to be flat, and muddy, they are a good record of what I was looking at and photographing back in my salad days.