The film reminded me of the similar Kodak film on film manufacture from 1958.
I thought this lens making film to be from the 50's.
Are there other other hints that Point to the 40's?
-) the film starts with showing a Kodak Ektra
the Ektra was a pre- and post-war camera, but the real indicator that it is a 50s film is that it shows a guy using a Kodak Chevron to take pictures -- the Chevron followed the Medalist and was first produced in 1953...