Van Keuren Vintage 4 Inch Optical Flat 1c 1v Quartz Dual Side Exe Cond Tested

US $250.00

  • Hoschton, Georgia, United States
  • Jan 30th
Both sides checked as you can see.  Excellent condition only a few faint scratches on both side.  FYI, 1=reference grade, 2=master 3= working, and since even the optical flat can never be truly flat C=concave and V= convex Working .000004" Master .000002" Reference .000001"

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