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[Connealy]

I posted this query recently in the 828 Group at Flickr, but there seems to be only me and one other guy there and an answer to the question seems unlikely.
 


 
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[Br1078lum]

May have been some sort of code that Kodak used when post-processing the film, which determined what type of slide mount was used (on chromes).  Could also be convenient to the owner to know what camera they used.  I've seen negs from other cameras wi

[Connealy]

I think you are likely on the right track with those ideas.  The first thing that came to me was the notches on sheet film, but those would have produced black bumps intruding on the image area.  As I recall from my early darkroom days, those notches

[Clay]

Newspapers notched them so that the layout guys and  
printers knew which photographer to credit.
Best regards,
/Clay

[Biloraguy]

Clay is right. I remember big city press photogs filing notches in their Rolleiflexes so people knew the film came from their camera not somebody else's. I assume they did it earlier to Speed Graphics, too.