This is a Yashima-yaki sake cup, likely with no other similar items. It is probably a detached piece from a sencha tea set. The exterior has a mottled surface, and the interior shows signs of extensive use with crackle staining. The design of the island of Yashima with a bird mark on the mountain is, I believe, rare. Diameter: Approximately 8.3cm Height: Approximately 4.2cm Sizes are approximate. The actual item may differ slightly in color from the images. As this is an old item, there are age-related scratches, stains, and other imperfections. Please examine the description and images carefully before purchasing.