I have a surplus 3.5" minor axis secondary from a discovery dobsonian and a 2.6" secondary from a Meade dobsonian. They appear to be in good shape with no physical damage. The 3.5" has a blackened edge. The coatings on both secondaries looks OK--no obvious nicks or scratches. Since these are surplus, I'm looking for $50 for the pair and I have a strong preference for a SoCal sale.