Go (game) handkerchief

This is a handkerchief with Go Encyclopedia written on it, contained in a plastic case. It was found in my family home, and I don't have any further details. The handkerchief is a pale yellow color. The case has some dirt on it. Please understand that this item has been stored at home. Edited by: Hayashi, HiroshiSize: Box - Approximately 11 x 7.5 cm faultless for everyday use. first-class materials and excellent craftsmanship ensure long-lasting durability.