Unfortunately, RFF tells me I'm over my limit for pictures, so I can't post one. The seal is a felt washer, it's 8mm across with a 4mm hole and it's about 1mm thick. It fits nearest to the body, slipping over the rear shaft of the small black drive-piece that connects the wind-lever to the timer mechanics.
Welcome to RFF, by the way. I hope you get to enjoy the Zorki, let us know how you get on.
Zorki: 1e (x2), 2C, 3M, 4, 4K, 5, 6
FED: NKVD, 1g, 2e, 3a, 3b, 4L (x2), 5B, 5C
Kiev 4, 4A
Yashica Minister III
Zenith C, Zenit C, Zenit E
Minolta XG M, Z1
"The way to see by faith is to shut the eye of reason."- Benjamin Franklin