Wu Zhu, inner rim only on the right side of the hole, head of Jin tilting right, stout outer rim / Inner and outer rims. 22mm, 1.62 grams. Hartill -; Gratzer/Fishman "One Thousand Years of Wu Zhu Coinage" #9.13. 

The rare Wu Zhus associated with Sui Emperor Ming Di (605-618) are fairly similar to the normal Sui Wu Zhus, though they are cruder and much smaller and lighter than the earlier Sui issues, measuring only 16-22 mm, 0.4-1.9 grams.

Emperor Ming Di is generally considered by traditional historians to be one of the worst tyrants in Chinese history and the reason for the Sui dynasty's relatively short rule. His failed campaigns against Goguryeo, and the conscriptions levied to man them, coupled with increased taxation to finance these wars, and civil unrest as a result of this taxation, ultimately led to the downfall of the dynasty.

The Sui dynasty was a short but highly important Chinese dynasty that ruled from 581 to 618 AD and reunified China after centuries of division following the fall of the Han dynasty. Founded by Emperor Wen, the Sui centralized government power, reformed taxation and administration, and began major construction projects, most famously the Grand Canal, which linked northern and southern China. The dynasty also strengthened the Great Wall and promoted Buddhism. However, massive public works projects, heavy taxation, and costly military campaigns against Korea exhausted the population and led to widespread rebellions. The Sui collapsed in 618 AD and was succeeded by the far more enduring Tang dynasty, which inherited many of its reforms and institutions.