Medieval coinage was incredibly complex, and it’s not much different in Westeros. Ancient coins representing dead kingdoms are used alongside recently minted royal coinage, precious metal content varies between one mint to another (and one unscrupulous merchant to another), some coin is "black" and nearly worthless, some are "white" and extremely valuable. The Shire Post Mint attempts to bring to vivid life some of these currencies with its series of A Song of Ice and Fire coins.
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