Boxed set of 5 Japanese sake cups with hand-painted birds - Rare

The interior of each ornately painted cup has a different image of birds amid a floral background. This is a matched set.  Each cup is the same size with the same exterior. 

The exterior of the cups is a blue and white abstract landscape design.

Labeled "Made in Japan", in original box

Cup diameter is approx 2 1/8 inches

Cup height is approx 1 1/8 inches

Box measures 4 3/4 x 7 1/8 x 1 1/2 inches