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12.5" Diameter x 1.0" thick borosilicate primary mirror blank

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Also got this from an optical shop a few years back to work on some new telescope optics but never got around to it. The shop couldnt confirm  if it was Pyrex 7740 or Schott Supramax. No chips, nice edge, beveled on both edges. Will need some grinding to smooth the back surface. 

Paypal and Shipping extra.