Is this the only known film of Anne Frank?
I suppose she might have shown up on a tourists home movies but nobody would know who she was. I guess owning a film camera in those days was petty rare too.
My late MIL had National Geographics going back to the 1920's, and I always found the advertising very interesting.
Common themes were The Safety of Banks, The Fun of Traveling the World, and How Easy Our Movie Camera is to Use...
As I recall, you got about 3 1/2 minutes from a 50 foot roll, at the lower ( 18 fps ) speed.
We sure have it easier, now.