I've tried to read all the old threads about the Accutron crystals and there is plenty of documentation out there that matches crystals to cases maintaining originality.
The problems facing many of us is that our watches are using replacement crystals especially from Clark.
Here's a profile of my Accutron Spaceview with a Clark crystal:
I don't think the crystal profile is correct but I have not found good pictures with which to compare.
Would some of you with more knowledge and original examples of Spaceviews and Astronauts please post some side view pictures of your watches for a basis of comparison.