This can be used visually, or for photography. Glass is pristine, OTA liner is about 55% worn away. Will be easy to repair, replace, or ignore. It is 6 1/2" across and should fit OTAs from 6 1/8" to just under 6 1/2".
I have the care and use sheet, lens cleaning cloth and about a dozen stick on pads to snug up the fit if needed.
These are $90 new, I'll ship to you for $55. No paypal.