Mr. Yamanaka hid 5 yen coin inside box This Puzzle Box is a more complex than the traditional style 10 Step Box. Measures* 5.75 x 3.75 x 2.75 inches Secret Compartment measures * 4 x 3 x 1.75 inches + Tiny Coin Slot INSIDE lid! Stamped by Yamanaka-san Comes with opening diagram. High quality finish.