I have a new old stock roll of Tower Film 620 Pan No. 7107 process before July 1961. It has an emulsion number of 2145100 and was made in Belguim. The included paper work has a bunch of different daylight film speed ratings: ASA 80, Weston 64, G.E. 100, Ame Sheiner 31. Does anybody have experience with older films like this and have some guidance as to what ISO to shoot at and what developers to use? I think it would be fun to shoot. It was included in a bag of flash bulbs that I bought at an antique store for $5. I also have some 2 rolls of Jet Age 620 Color negative film dated July 1965. It says "film will be damaged on ordinary developing equipment" "This film must be developed by photomation film lab on our special equipment or returned to our national hqs" Would this film be any good after all these years?