sentences:  This was the reason for the reintroduction of won in 1962 as the official currency unit.South Korean currency was still pegged to the US dollar until in 1997 when it was floated into the world market.The ŭnbyŏng (銀瓶, 은병), or "hwalgu", were silver vases that were shaped like the Korean peninsula and were widely used during the Goryeo period, they primarily circulated among the aristocracy.