At first glance, the Hanayama Cast Spiral by Kennet Walker of Rivermore, California doesn't seem unlockable. The five pieces, however, can most certainly be taken apart. The Hanayama Cast Spiral key word is “Spiral”.
Aside from the usual puzzle of taking the Hanayama Cast Spiral apart, putting it back together is a whole new problem in itself. Try not to apply too much pressure when attempting to solve the Hanayama Cast Spiral. Solve it or not, the five pieces exude a kind of elegance, spiralling into a comfortable fit in the palm of your hand.
At a 5/6 difficulty, solving the Hanayama Cast Spiral is going to be tough! Can you take it apart? Can you assemble it again? No solution included!