Vintage C8 Visual Back

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I recently acquired a 1972 C8 but it came without a visual back. Unfortunately, today’s visual backs don’t fit the threads used back then. I’m hoping there’s one out there that might be looking for a new home.
Alternatively, if anyone knows the old thread pitch I’d love to hear from you.
Thanks in advance and here’s wishing everyone a warm and happy Thanksgiving!

rpn

Funding Member

Telescopes, Astronomy, Binoculars