This wooden puzzle has nine holes which hold one or more pieces each. There are eighteen pieces, but these do not fill all the holes. Each piece has a hole in the top, perhaps to hold a knob for lifting the piece. There are no knobs. A mark on a sticker on the back of the test reads: Dr. Samuel Kavruck (/) Specialist, Testing Programs (/) Guidance and Counseling Programs Branch (/) U.S.
Reference:
C.H. Stoelting Co., Apparatus, Tests and Supplies, Chicago: 1936, p. 130, 132.