Slowakische Kassettensite mit allen Einlegern

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Now what I meant was, any production pictures from any company.

I already understood it that way... so no... never saw any interesting production related pics/vids of any relevant maker from the heyday of tape.

but I found the numbers in the magnetic layer overprinted on the tape at the beginning...  How could this have happened?

My guess... batch number at the start of new of base film jumbo and they forgot to cut that out...

Is it visible from the other side too?