This is Saikou Kotou-yaki. Seiryu (Azure Dragon): A noble motif, a mythical beast from the Orient. Kiri (Paulownia): Revered as a sacred tree in Japan since ancient times, and a noble design used in the Imperial and government crests. The combination of these noble motifs suggests that "Seiryu Kiri" was likely a design used in high-class works from the Han kiln period, such as offerings to the Hikone lords or special orders. If you own a "Seiryu Kiri" work, it may be a very valuable item due to its rarity and historical significance. The size is 11.2 cm in diameter and 4 cm in height.