A Rare Blue and White Archer's porcelain Ring, decorated with very neat and powerful Dragon swirling around the body among clouds scrolls.Ming Dynasty probably 15th Century, in perfect condition, Height; 2,6 cm and unglazed rim Diameter: 2,9 cm. A thumb ring is a piece of equipment designed to protect the thumb during archery. This is a ring of leather, stone, horn, wood, bone, antler, ivory, metal, ceramics, or glass which fits over the end of the thumb, coming to rest at the outer edge of the outer joint. Typically a flat area extends from the ring to protect the pad of the thumb from the bowstring; this may be supplemented by a leather extension. (Source from Wikipedia).