This Tenmoku tea bowl is a valuable ceramic piece fired during the Song Dynasty (960 to 1279). Its significance is further emphasized by the inscription "供御 (Gongyu – For the Imperial) on the bottom. This mark indicates that the bowl was made specifically for presentation to the Imperial court, signifying its high status. In the Song dynasty, 供御 referred to objects designated for the exclusive use of the emperor, often produced under strict supervision in official kilns. This means that the bowl was not for general market circulation but was likely used in tea preparation within the Imperial Palace, making it an exceptionally rare and important piece.