https://www.filmfix.com/en/extra-image-on-normal-8mm-film/
8mm film hidden image between the sprocket holes
Occasionally, Double-8 (aka Normal-8, Regular-8) film cameras captured additional image between the sprocket holes.
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NK140B25D60F | Standard Sprocket - 140B - C type - Semi F Series - Shaft Holes Machined (New JIS...
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