I decided to send the Welta Weltur our for a bit of a CLA. The rangefinder / viewer is a bit foggy and makes it difficult to focus easily. That is taken care of by using a smaller f-stop, thus increasing the DOF. I am not sure how this light leak occurred – perhaps when it was being developed.
Taken with Ilford XP Super 400, Welta Weltur from 1937, Xenar lens. Guestimated exposures. Scanned with Epson V600.