Art Pottery Hand Crafted Porcelain Ceramic‎ Sake Cup Vase Oriental Japanese 4.5"

This vessel is 4 1/2 inches tall, and holds 12 fluid ounces. Because of it's size I'm not sure it is a drinking glass, could be a vase. Inside is glazed, outside has matte finish. The decoration is cut into the ceramic. It is signed on the bottom.