Signedon plaque on ring base: American Optical Company / Scientific Instrument Division / Buffalo 15, New York
on plaque on ring base: MADE IN U.S.A.
on plaque on ring base: AO [in shield]
on plaque on ring base: JARRELL-ASH COMPANY / SCIENTIFIC INSTRUMENTS / BOSTON 16, MASS.
Historical AttributesUsed in the Mineralogical Museum at Harvard University.
ProvenanceMineralogical Museum, Harvard University; transfer to CHSI, 2004.