VERY RARE Mid-60's Psychological Corporation "Stromberg Dexterity Test" In Case For Sale

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AN EXCEEDINGLY RARE Mid-60's Psychological Corporation "Stromberg Dexterity Test" In Carrying Case. Includes 53 of the 54 ORIGINAL discs plus an original "Preliminary Manual". NOTE: the discs are derived from a what looks to be a standard 1.25" wood dowel, so a replacement of the one missing may be easily and faithfully fabricated. The wooden case measures 17 7/8" x 21 3/4". The set overall is in VG condition. The 8-page manual is in GOOD- condition due to some creasing and spotting. PLEASE SEE ALL PHOTOS.

BACKGROUND: The Stromberg Dexterity Test (SDT) is a standardized psychomotor evaluation tool developed c.1945–1947 by psychologist Elroy L. Stromberg 1905–1955) to measure basic manual dexterity, speed, and accuracy of arm and hand movements. Stromberg was an industrial psychologist and personnel research manager for B.F. Goodrich Co. IMPORTANT: the only known example of this set I could find online resides in the London Science Museum. The National Museum of American History in the U.S. seems to have the manual only and not the set per se.