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Mamiya 645 AFII - what is this number on the negatives?

billorg

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I just developed my first roll from my Mamiya 645 AFII (Ilford HP5) and I was wondering what the number "4713" is printed in the data area on the edge of the film? Thanks, bill
 

Dustin McAmera

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I think it's Ilford's batch number. See this other thread, where they have 4274:
 

Dustin McAmera

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It's in a different font and size from your film-back's imprints anyhow.