The Mido Multifort and other Mido's from the mid 1930s until, I believe, at least the 1960s used specially treated natural cork to seal the winding stem against water ingress.
Movados of a similar age also had a similar system of cork stem seals.
Does anyone have any experience of working on these, any factory service manuals, spare parts or any other knowledge about these cork stem seals?
Thanks for any help!
Regards - David