Toyo Glass was founded in 1878 during the Meiji era, merging with Sasaki Glass in 1957. Toyo Sasaki Glass (TSG) is a company comprised of master craftsmen who specialise in the art of glass-making. Each artisan requires at least 15 years of glassmaking experience to be accepted by the Certified Traditional Japanese Craft-Masters, a prefectural association that credits prestigious artisans for their utmost ability and expertise on Japanese traditional crafts.