OK, film re-wound shutter on B with bright flashlight. I don't see anything there. Is it possible it was stuck there well enough to go through a whole roll of film and came out when I changed canisters?
Thanks everyone!
Looks like a hair near or on the shutter.
I have seen this once before, the culpret was the felt light trap on the actual cassette, part of it was peeling from the film can and sticking out over the 'gate'.
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