It would be very easy to determine if the original neg dated from 1947 -- EK used to use little symbols lilke +*x, which denoted year of manufacture. Also, 16mm film from that era probably would have no edge numbers. Also, EK was only one of many manufacturers then. DuPont, Ansco... I thought the little clip I saw showed a style of shooting that was very faux-home-movies. Dubious.