Can anyone familiar with this model tell me if it originally had fabric or foam seals in the film back channels, or just relied on a labyrinth? My copy shows no sign of such,but has bad fogging top and bottom of images.
I'm not familiar with this camera but I've read about yak hair yarn. Unless this particular yarn as a special feature which I'm unaware, you could use use wool yarn as a replacement. Also, you could ask Oleg at Okphotocameras, he's the soviet camera expert.