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AMERICAN OPTICAL COMPANY SKU: 16222 Barcode:
Stock No. 16222
Author: American Optical Company
Philadelphia: Beck Engraving Co. 1940
Book of folding colour plates made up of dots with numbers in contrasting colours on each one. Includes the instructional slip for usage. Original black cloth with gilt lettering to front, housed in the blue cardboard box which is split at some joints. Lettering on spine somewhat faded.
