Very cool, don't think I've seen this particular one before. It perfectly shows how labour intensive hatmaking originally was.As far as I know this is the only film (not very good condition) of the processes that Stefan mentioned above. I just made this clip.
See sections (in sepia tone) from a 1942 by Janyska & Cie. (Czechoslovakia) and it shows skin preparation, hand cutting of fur and manual felt making. This clip is taken from a video about Panizza so the commentary is Italian hat industry related so fur skin sourcing would have been different for Janyska & Cie.