
A dubbeltje is a small former Dutch coin, originally of silver, with a value of a tenth of a Dutch guilder. The 10 euro-cent coin is currently also called a dubbeltje in the Netherlands. The name `dubbeltje` came from `dubbel` (Dutch for `double`) because it was worth two stuivers. When the decimal system came to the Netherlands (about 1800)...
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http://en.wikipedia.org/wiki/Dubbeltje

a silver ten-cent piece of the Netherlands.
Found on
https://www.infoplease.com/dictionary/dubbeltje
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