http://www.ebay.com/itm/South-Korea...nze-Unc-Mostly-Red-/382226482403?roken=cUgayN According to a 1988 article by Korea/Japan coin expert, Joseph E. Boling, the Bank of Korea would countermark coins they shipped to foreign countries with this "견양" (sample / specimen) stamping: He wrote, "ROK specimen coins are virtually unique among modern issues in their availability outside official channels. No other nation known to me routinely applied specimen markings to her coins. ROK law prohibited the export of her currency, even in token amounts, so anyone outside of Korea who ordered a 4292-dated coin set from the central bank received a set with "sample" stamped on the reverse in two characters. These are by no means common, but are nevertheless occasionally available, whereas such items from other nations are hardly ever seen, let alone available." -author quoted at length from the article, "Beyond Cash: A Numismatic Survey of Korea" from World Coins, July 1988.
