Solid Brass Jack Puzzle
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This puzzle is comprised of six different notched brass bars that interlock in one specific way to create a unified "jack" shape. It's exactly milled by a skilled machinist in Massachusetts, and it weighs one pound.
It's 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...