This is a beautiful Ryukyu glass bowl, a traditional craft of Okinawa, created with the image of a deep blue starry sky. It was purchased by my grandfather several decades ago. There is a signature on the bottom, but I cannot read it. Indigo Blue: Diameter approx. 21cm, Height approx. 7.2cm Red: Diameter approx. 21.5cm, Height approx. 6.2cm