5 Piece Sake Set from Japan

Sake is important in Japan so they make stunning sets to drink it with. This 5 piece set includes 1 bottle and 4 cups. It is a very dark brown on the outside surface but in the bottom of the cups is a beautiful crackled blue color. Bought in Japan and decorated a shelf but never used...in great condition. Bottle measures 6.5" high. No markings on the bottom