Antique Japanese Chessboard Shogiban, early 1900s

Antique Japanese chessboard Shogiban, originating from the early 20th century. This Japanese chessboard, called Shogiban, is made of solid Keyaki wood. Completely handmade with light signs of use due to long-term use, natural expansion of the wood, and a very beautiful patina. Various Japanese characters on the bottom, but it is unknown what they mean.