a.k.a. Endless Chain
Plas-Trix Co., Jamica, NY, circa 1957.
(plastic box and 14 plastic pieces, 4.75 by 4 by 5/16 inches;
same size / shape box as the Krazee Checkerboard Puzzle that is shown
on pages 57-58 of the Haubrich book, which gives the manufacture date; a puzzle like this is shown as the "Endless Chain" on page 99 of the 1893 Hoffmann book)