The Haselgrove box is a unique puzzle based on the locking mechanisms of the Egyptian pyramids. The ancient Egyptians had knowledge of this mechanism and they used it when closing the pyramids.

 

Once you get the Hasegrove Box open, you’ll notice that the larger piece viewed sideways on, is in the shape of the letter J.  However, if you look at the top face it takes on the shape of a letter H...  the initials of its British inventor, Jennifer Haselgrove!

 

This is a particularly high quality version of this puzzle! 

 

Dimensions: approx. 3.5 x 3.25 x 3.25 inches.