Watch List notes:

China, Northern Zhou (557-581 AD), ? ? ? ? Yong Tong Wan Guo, round cash, with square hole, c. 579 AD, 30 mm, 5.72g (H. 13.32; FD 644; S. 250). Very Fine with beautiful calligraphy. Meaning Everlasting Circulation in Ten Thousand Kingdoms. Issued by Emperor Xuan.