These little sake cups are adorable. They are signed on the bottom but I am not familiar with the artist. They are in great condition. No chips, cracks or crazing. The blue wing bird measures approximately 3 inches long and about 1-3/4 inch diameter rim. The cup is about 1-1/4 inches tall. Bottom is 1-1/4 inches in diameter. The yellow wing bird measures approximately 2-3/4 inches long. 1-3/4 inches rim diameter. The bottom rim is about 1-1/4 inches in diameter. It is almost 1 inch tall. I am not sure of the date they were made.