CHINA, Wu Zhu ("500 millet seed") coins.
    The Wu Zhu coins were a reform to regularize the currency after the anarchy of the Ban Liang coins, which anyone could cast in any size they wanted.  The zhu was 100 millet seeds.  After a brief experiment with 3 zhu they decided they likes 5.  The coins were made to aspire to a standard module from about 118 BC until after the end of the Han dynasty in 221 AD (with time out for Wang Mang).  After the end of the Han Dynasty the denomination persisted, but people started fooling around with them, making them smaller, adding extra characters, etc.  All told the Wu Zhu coins were made for about 700 years.

27195. CHINA, W. HAN Dynasty, 206 BC -7 AD, San Zhu, H8.1, S-103, outer rim, "wood grain" rev., F $185.00 sold 3/18/2009
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CHINA, W. HAN Dynasty, 206 BC -7 AD, Wu Zhu, S-114, squared shoulders on right side of zhu (character on left), F $17.00 sold
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CHINA, W. HAN Dynasty, 206 BC -7 AD, Wu Zhu, H8.5, S-114, ND (115-113 BC), squared shoulders on zhu, black laquer both sides, XF $21.00 sold
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CHINA, W. HAN Dynasty, 206 BC -7 AD, Wu Zhu, bar across top of hole obverse, S-115, 60 BC according to Schjöth, Jen says 113 BC, VF $24.00
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CHINA, W. HAN Dynasty, 206 BC -7 AD, Wu Zhu, (113+ BC), bar across top of hole obv., projecting nubs at top & bottom of Wu, VF+ $33.00
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27198. CHINA, W. HAN Dynasty, 206 BC -7 AD, Wu Zhu, H8.8, S-115, ND (113+ BC), bar across top of hole obv., projecting nubs at top & bottom of Wu, XF $36.00
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CHINA, E. HAN Dynasty, 25-221 AD, Wu Zhu, S-257, with rounded hips on the zhu.  This is the common one, but nice condition, VF $6.50 sold
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CHINA, Wu Zhu, S-258, wide half dot below hole obverse, VF $21.00
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CHINA, Wu Zhu, H10.32v2, S-260v, dots at top & bottom edges of hole obv., chip in the patina on edge, dirty XF $21.00
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CHINA, E. HAN Dynasty, 25-221 AD, Wu Zhu, Wu Zhu, H10.33, S-178a, horns from corners inner rim obv., VF $24.00
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271136. CHINA, E. HAN Dynasty, 25-221 AD, Wu Zhu, H10.34, S-258, half dot on bottom of hole obv., further attribution by Roger Doo on back of holder - 6 BC-5 AD, rough VF $27.00
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CHINA, E. HAN Dynasty, 25-221 AD, Wu Zhu, S-257v, vertical line below Wu, VG $21.00 sold
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CHINA, E. HAN Dynasty, 25-221 AD, Wu Zhu, H10.37v, horizontal line bottom L obv., F $23.00
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CHINA, Wu Zhu, 2 incuse vertical lines bottom obv., VF $33.00 sold 12/18/2008
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271 0128. CHINA, Wu Zhu, H10.4v, S-nl, dots on inside of top & on bottom of Wu, aF $33.00

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CHINA, Zhu Wu, H-nl, S-268v, Jen-1004, character order reversed, crusty F $36.00 sold 3/14/2013
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CHINA, Zhu Wu, H10.41v, S-268v, character order reversed, half dot on top of hole obv., light crust, F $38.75
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CHINA, "Si Chu" Wu Zhu, "4 horns" at inside corners obverse, S178a, FD-511, FD = 186 AD, Tye = Wang Mang.  I agree with Tye on the basis that some of these specimens have black lacquer, a Wang Mang specialty. Few scratches, AU $18.50 sold
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CHINA, Wu Zhu, S-208v, FD-597v, tiny 12mm coin, half dot at bottom inner rim obv. & lacquer.  E. Wu Dynasty, 229-265 according to Schjöth, but Tye argues, and I incline to agreement, that it is probably a Wang Mang issue.  XF $21.00
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Numerous other Wu Zhu coins in stock in the inventory
Other coins of this time period