I had both of my RV-6 mirrors recoated, one at Newport Glass and another at OWL. If I remember right, both cost less than $100 and that included insuring each mirror for $150 and shipping both ways. Worse case, if the scope is in good condition with a trashed mirror coating, I'd consider the $300 total worth the price. Good luck.

Keith (no Criterions in the herd yet

)