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Original Silly Putty A bit smaller than I imagined, a bit larger than a quail egg. Works nicely though!
The Jack Puzzle is comprised of six different notched brass bars that interlock in one specific way to create a unified "jack" shape.
It is exactingly milled by a skilled machinist, and weighs just over one pound. A desk object, a paperweight, and a true distraction—but be forewarned, if you take it apart, you might not be able to figure out how to put it back together…
(Hand-drawn assembly instructions are included)