This is a set of two retro Showa-era glass cups featuring illustrations of butterflies. They are characterized by a design of blue butterflies. The word "SASAKI" is on the bottom of the cups, so they are likely made by Sasaki Glass (currently Toyo-Sasaki Glass). There is text that says "Toshiba IC Brightron." They are designed to be stackable (see the last photo). Please refrain from purchasing if you are concerned about minor details, as these items have been stored at home.