ST 83:1996 : For Motion-Picture Film (16-mm) — Edge Numbers — Location and Spacing
The Society of Motion Picture and Television Engineers eBooks · 1996
(1.1) Specifications — This standard defines the location within which edge numbers will appear on 16-mm motion-picture film. The maximum interval between successive numbers is also specified. (1.2) Application — This standard applies to latent-image printing of edge numbers as well as to any other method of printing such as inking.