Patented by T. Graham 1934, made by the Embossing Company of Albany 1937.
(cardboard box 4.4" x 4.4" x 5/8" inches and 13 wood pieces;
dates the blue version above as made in 1937, and gives a solution)
Slide the pieces, avoiding the two forbidden squares,
to get go from a start position to a final position;
here are problems 1, 2, and 3 from the directions that were sold with it:
The Other Pages Of The Time Puzzle Directions
Copyright 1942, Lowe Bookshelf Games, New York, NY.
(cardboard case, 4.6" x 4.6" x 7/8"; was also made with a red case)
Graham 1934 Design Patent,
from: www.uspto.gov - patent no. Des93,344
Graham 1935 Patent,
from: www.uspto.gov - patent no. 1,989,411