Two large Chinese characters Wu Zhu ("5 zhu"), with a characteristic rounded "Zhu", character "/" above Zhu and "X" above Wu (possibly standing for "Yi Shi" or "Shi Yi" ("11"), shallow outside rim / Blank, inside rim, shallow outside rim. 26mm, 4.08 grams. BM Chinese coins (Poole) #398-403var. (without the marks); Hartill 10.2var (see note on page 93); Schjoth 178var (without the marks).
Some Wu Zhus from the Eastern Han dynasty period show a variety of marks, either on obverse or the reverse. The system of placing the a "star" or "stars" (small blobs) in different positions on the obverse was probably a way to mark a mint of a particular issue of coins - the system is undecipherable and is not yet understood.
The Han Dynasty (206 BC-220 CE) was the second imperial dynasty of China, preceded by the Qin Dynasty (221-206 BCE) and succeeded by the Three Kingdoms (220-265 CE). It was founded by the peasant rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han. It was briefly interrupted by the Xin Dynasty (23 CE) of the former regent Wang Mang. This interregnum separates the Han into two periods: the Western Han (206 BC-9 CE) and Eastern Han (25-220 CE). Spanning over four centuries, the period of the Han Dynasty is considered a golden age in Chinese history. To this day, China's majority ethnic group refers to itself as the "Han people".
This coin is unconditionally guaranteed to be authentic.