Thank you for viewing. I purchased this many years ago, so I'm not certain of the manufacturer, but I believe it was Spectrum. I haven't used it, so I'm offering it to someone who needs it. Please check the size in the photos. I plan to ship via Yu-Packet Post. I will carefully pack it to prevent breakage, but there is a possibility of cracks or chips occurring during shipping. Due to the nature of the item, I cannot accept returns in such cases. However, if such a problem occurs, I would appreciate it if you could let me know so that I can prevent it from happening again. Please purchase only if you understand this. I will clean it again before shipping, but please understand that there may be stains or writing marks that cannot be removed due to long-term storage. If you are concerned about fine details such as streaks, air bubbles, small scratches, or stains from the manufacturing process, please refrain from purchasing. Also, please consider that there may be differences in color due to your computer environment or smartphone, and errors in size and other numerical values. #Showa Square Glass #Showa Glass #Stained Glass #Plate Glass