1979, 30th Anniversary of the People's Republic, 400 yuan, complete set of four proof gold coins, weight 16.95g x4 (0.917 gold), AGW 2.000oz, each coin is in individual plastic capsule, housed in specially produced wooden box with COA, a scarce item, 23,000 sets were produced (Est. $4,500-$5,500), KM4-7