Old glass for a game called "ishike-ri" (stone kicking). There are two embossed flags on the surface. One appears to be the Rising Sun flag, and the other seems to be a flag related to the navy. It resembles the watch flag or warship flag of the Imperial Japanese Navy or the Manchurian Navy (as seen in "Flags of the Imperial Japanese Navy" and "Flags of Manchukuo" on Wikipedia). Due to the nature of the embossing, it is likely from before or during the war. The difference in thickness on the sides, with a tapered shape, is interesting. There is some dirt on the surface. There is a very small round chip on the side (please see the last photo). Please check the photos for other details and size. Please read and understand the contents of the profile section as well. We look forward to your purchase.