Found 3 farrsight discs that flip up are they worthwhile or not. Worth anything? thanks Rich

Rich, optical devices like the Farrsight are most certainly worthwhile for those who use them. Farrsight is no longer in business but an outfit named Merit makes a similar, if a bit more complicated, device: http://www.meritcorporation.com

I'm sure you wouldn't have a problem selling the Farrsights you have if in good shape and priced reasonably.

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