The Haselgrove box is a unique puzzle based on the locking mechanisms of the Egyptian pyramids. The Egyptians had knowledge of this type mechanism and used it in sealing their tombs.

Once open it you’ll notice that the larger piece viewed sideways is in the shape of a J while if you look at it from the top it takes on the shape of a letter H- J.H., the initials of its British inventor, Jennifer Haselgrove.

This is a particularly high quality version of this puzzle, a difficult challenge, and a great value.