I found these while cleaning out my parents' house. The one on the left appears to be a "hidasuki" (fired with straw) piece, and I think it says "Taizan" on the back, but the details are unknown. It's in good condition. The one on the right seems to have been used frequently, as the area around the mouth has changed. There is no box. Right size - Diameter 5.5cm x Height 4.5cm Left size - Diameter 5cm x Height 6cm #Bizen ware #Used item #Guinomi (sake cup)