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BTW, I really liked the 1st AC with the smoking pipe.
Not too sure when this video is set.
If it was before the 1940's and maybe even some of the early 1940 years, it could very well have been nitrate film. I have no idea what that stuff was rated. My guess would be a big combustible 10?
Starting around the 1950's on onward... if you wanted to shoot color negative, you basically had a choice of 12d, 25t or 50t. I think by the early sixties, you could go 100t.