Above:In original package
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A 60 mm knock-off with reflective paint on the chain links.
A knock-offed version produced no later than 1982 because these were mentioned in David Singmasters Cubic Circular Issues 2 from Spring 1982.
Images 5-6 show an alternative version named "Link Puzzle". The type of key chain is different but the puzzle and the size are identical.
Size: 16 x 16 x 64 mm
Thank you to the following people for their assistance in helping collect the information on this page: Sandy, rubikfreak.
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