Pentax 6X7 Focus Screen Question

[Darko Kamer]

Hello

Working with a Pentax 6x7 at waist level and wondering is stock focus screen glass or plastic? Short of taking it apart I do not think I'll be able to tell.

.Cheers
Darko

 

[Scott Micciche]

I believe they are acrylic as I have seen some scratched.