21 steps Rosewood/Ichimatsu 4 sun Japanese puzzle box Himitsu-bako [4-21nri]

**A sliced natural Rosewood is stuck on the top and bottom panels, Not solid wood board, and the side panels are made with checkered yosegi.
Opening method of the puzzle box : 21 steps
Moving panels and Slide keys : 4 panels / 2 keys
Outside size : 4.5 x 3.0 x 2.1 inch (115 x 80 x 53 mm)
Inside storage space size : 2.60 x 2.4 x 1.2 inch (66 x 63 x 30 mm)
Includes description (solution sheet for how to open) and gift box

4 sun size Japanese puzzle box. 4 sun is a Japanese measurements. 1 sun is about 1.18 inch / 3.0 cm. This puzzle box is opened in 21 steps. The Japanese puzzle box is made from only wood. This design puzzle box is crafted by Hiroyuki Oka.

"The Japanese puzzle box (Himitsu-bako) is made only of wood, environmentally-friendly products. This a one of traditional art work of Japan. The origin goes back even to the Edo and Meiji era (1800s) in Japan. It has been handed down by the very few craftsmen. I am crafting full-time these puzzle boxes by myself. I had training for 10 years and I'm crafting these Japanese puzzle boxes and Yosegi-zaiku for over 20 years. All items are made in my workshop and shipped to you directly. I will promise that all boxes are of good quality. My Puzzle boxes will move smoothly, because I will check and test all puzzle boxes before shipping. If you have a question, Please feel free to ask me anything. Thank you!. Hiroyuki Oka"

The puzzle box outside (Length) size : 1 sun (Mame / 4.3cm / 1.70inch) , 2 sun (6.0cm / 2.35inch) , 3 sun (9.0cm / 3.54inch) , 4 sun (11.6cm / 4.56inch) , 5 sun (15.0cm / 5.90inch) , 6 sun (18.0cm / 7.00inch) , 7 sun (21.0cm / 8.25inch).