J 120 "The 60th Anniversary of the Palace Museum", a full set of 4 stamps (four stamps printed vertically), the market price of this set of stamps is greatly influenced by the appearance, and the gold powder used for printing this set of stamps is very easy to be oxidized and blackened.

At present, the market price of each complete product is around 20 yuan, and the market price of each defective product is around 6 yuan.