I recently got a type 350 Amphibia. As it is my "grail" as far as vostok watches go, I couldn't resist buying it despite it being a bit rough condition wise.
I have cleaned it and replaced gaskets.
The original crystal is badly scratched and has yellowed as old plastics often do, so I will replace that too with a modern one.
BUT, the tension ring of the crystal has a camfered/angled inner diameter. Now I can't remember how it was assembled in the first place.
Do i put the narrow edge faced up (making it sort of a chapter ring) or down?