This appears to be an Edo Kiriko (Edo cut glass) wine glass, a traditional Japanese craft. It could also be used as a sake cup for an aperitif. Glass Characteristics: Traditional Techniques: The "irokise" (colored overlay) technique, using copper or cobalt, is employed, resulting in a vibrant cobalt blue (indigo) color. Design: The cut glass design evokes Showa retro or Showa modern aesthetics, featuring floral patterns and intricate lattice-like details. Uses: Besides being a wine glass, it can also be used as a beer glass, or as a vessel for cold soups or desserts (ice cream or jelly).