My grandfather purchased this at an antique fair. I am selling it to organize my belongings. This is likely an Edo Kiriko cold sake cup (ochoko). It is a traditional Japanese craft with patterns on the glass surface. It features the "irokise glass" technique, where colored glass is layered over clear glass, creating a deep shine through the reflection and transmission of light. The techniques have been passed down since the Edo period, and a unique craft technique was established in the Meiji era by incorporating European cut glass techniques. We are looking forward to your purchase if you understand that this is a used item and has been stored for a long time.