SPENCER Scientific Instruments [ with pricelist AND ERRATA ]
Southbridge, Mass. American Optical Company, Export Sales Department [ circa 1946 ]. First Edition. 198, 203-207,  pages. 8vo. No date, but circa 1946. Original blue printed wrappers. Bruxelles distributor Andre Van Hopplynus de Cock sticker on front wrapper, and some additional ephemera from de Cock included with the catalog. Pages 199-202 (not present in the export edition of the catalog) contains Ophthalmic Instruments made by American Optical. Includes the catalogue, pricelist and ERRATA sheet (not usually present). The pricelist is dated 1946 but the catalogue is undated. Good. Wrappers. 
A useful catalogue for the collector of these instruments and anyone who wants to use an instrument from this timeframe. It allows the practitioner to determine what accessories were supposed to be present with the instrument as manufactured, specifications, etc. Many nice illustrations as well. A standard reference for anyone interested in Spencer / AO instruments.