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NASA owned, BK-7 Optical Glass Prism Blank:
$135.00
Nasa Surplus Optical Glass, MSFCSchott BK-7 Substrate Prism Blank3.5\" x 3.5\" x 4\"
Engraved and written info on the blank reads:IR 28417B/P 115257MELT# 14564SER# 18
Red Maker\'s Stamp affixed
