John, as the bands are vertical and not horizontal, it is not likely due to a faulty shutter but rather to a light leak in the camera. Most probably near the right take-up spool. Check the foam in the film chamber. Hopefully, this will be the problem and the repair cost should be low. I have such a problem with an old Minox 35 (a tiny vertical blue stripe) which turns me crazy because I can't find the origin of the leak. Hope this helps, Nicolas.
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