Jisho

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Noun
1. koban; small oval gold coin used in the Edo periodSee also 大判
Noun, Noun which may take the genitive case particle 'no'
2. oval; elliptical; oblongSee also 小判型
Noun
3. small size (of paper)See also 判 はん
Wikipedia definition
4. Koban (coin)The koban was a Japanese oval gold coin in Edo period feudal Japan, equal to one ryō, another early Japanese monetary unit. It was a central part of Tokugawa coinage. The Keichō era koban, a gold piece, contained about one ryō of gold, so that koban carried a face value of one ryō. However, successive mintings of the koban had varying (usually diminishing) amounts of gold. As a result, the ryō as a unit of weight of gold and the ryō as the face value of the koban were no longer synonymous.
Read “Koban (coin)” on English Wikipedia
Read “小判” on Japanese Wikipedia
Read “Koban (coin)” on DBpedia

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