If it's from the US then it was shot on a Kodak nitrate film, they can verify the stock https://en.wikipedia.org/wiki/List_of_motion_picture_film_stocks#Early_

If it's from the US then it was shot on a Kodak nitrate film, they can verify the stock https://en.wikipedia.org/wiki/List_of_motion_picture_film_stocks#Early_nitrate_films_(1916%E2%80%931941) https://en.wikipedia.org/wiki/List_of_motion_picture_film_st...