1987 Proof 2 Coin Set Seoul South Korea from 1988 Olympics . The 5,000 Won Is .925 Silver Weighing 16.81 Grams Totaling a 1/2 Troy Ounce, The 10,000 Won is .925 Silver Weighing 33.62 Grams Totaling 1 Troy Ounce and depicts archery. Comes with certificates of authenticity from the Korean Security Printing and Mining Corporation.