Japanese porcelain sake cup decorated in underglaze blue along its outside perimeter with 2 Portuguese sailors and their sail ship. Very nice potting, good stencil painting, in perfect condition. Marked on the bottom with spurious mark that can be translated as MADE IN THE YEARS OF SEIKA (Chinese Chenghua Emperor, reigned from 1464 to 1487). Diamter at the top 2 1/2 inches, height 1 13/16 inches.