It's a small porcelain cup. The mark on the bottom reads "Konan Kagel." This is seen on studio works of contemporary ceramics and crafts. However, it's not a mark from an old Japanese kiln (like Arita or Kyo-yaki), but rather a handwriting style and design closer to the signature of a private workshop in the West (especially Northern Europe and America). Unfortunately, one has a chip on the rim. Height: 78 mm, Diameter: 60 mm