This is a rare Ming Dynasty hetian white jade belt plaque featuring a four-clawed dragon dancing amidst a sea of flowers. On the four corners are depicted two lotus flowers, a bird and a bat (all of which are traditional auspicious patterns).
By Ming Dynasty laws, a jade belt may only be worn by the Emperor, other high-ranking royalties, and court officials of the first class (the first class is limited to the top few persons in the empire). This is recorded in the Ming official documents (in 《明史 舆服志》 as a royal decree). As such, jade belt plaques are very rare collector items - their value is testified by sales at esteemed auction houses.
Very large (17.5 cm long). According to Ming Dynasty customs, out of 20 pieces of large and small components of a jade belt, only the 2 largest pieces are this size.
Well-preserved through at least 400 years of history - with a minor defect indicated by an arrow in one of the pictures. Not obvious and does not affect the overall presentation.