Hi,
maybe you should ask this question on a forum for still-photography?
The "SAFETY-F" is most likely "SAFETY-FILM" with the ILM being located in a perforation hole.
The "100N" doesn't help as Fuji is using the "N" to mark newer emulsions (e.g. the Single8 Fujichrome R25 later became the Fujichrome R25N), while Agfa is using the "N" for an unknown reason on some of its edge-codes (e.g. the XRG 200 is marked as XRG 200N on the film - not sure whether the "N" is for Neu/New or for Negativ(e)). Not sure whether other companies used an "N" as well...
BTW: There could be more identifiers than just the "100N", e.g. notches, colour of the DX-code, some dots, ... :
http://gastonline.free.fr/Files/Film%20 ... hCodes.pdf
http://photondetector.com/tools_ref/filmdata/
http://en.wikipedia.org/wiki/DX_encoding
http://www.imageaircraft.com.au/DXsim/
http://www.ferraniait.com/Solutions/pho ... arch01.pdf
As it's a "no-name"-film from approx. 1980, it could be nearly anything: 3M (also known as Ferrania or Scotch), Afga, Fuji, Kodak, Konica, ... even Svema or Orwo.
Jörg
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