Cobalt blue Hand Blown Vintage Glass Cup. A Beauty!

Cobalt blue Hand Blown Vintage Glass Cup. A Beauty! 3.25 inches tall & diameter 3 inches. Translucent. Deep blue. Smooth. No flaws. Not new, but mostly unused & kept in my art collection. Which I am selling. & you can find other cool colored glass vintage cups , folk art, modern art, art supplies, books and loads more :) Age unknown. Artist unknown. Comes in a nice gift or storage box :)