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Japan learned about coinage from China and issued its first bronze coins around 708 AD, according toBrittanica Money.
Early in the 17thcentury, however, Japan returned to coinage by issuing the copperkwan-ei.
Since then, Japan has issued a variety of gold, silver, copper and nickel coins.
Sado Koban Gold Shield: $75,000
The Koban was used in the Edo feudal period in Japan.
It was estimated at between $20,000 and $30,000 but sold for much more than that.
They were minted in London but the designs were Japanese to the core.
The pre-sale estimate was $700,000 to 900,000 but the actual sales price was more than double that.
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