This work was designed and sold through a 2025 Karakuri Lottery and was a limited release. The crafter describes their work as, " The prototype of this work was produced in 1983. The inside structure and mechanism were completely different from those of the "Humibako D Series. In 2001, the “Humibako D series” was produced and became more practical. The mechanism has become relatively simple, but please do not make a mistake in the first move. " Crafted in Walnut, Keyaki (Zelkova), etc.. Measures approximately 250 x 86 x 66 mm. with a storage space of 226 x 56 x 36 mm. Arrives with opening instructions and gift box.