1980 China Olympic Committee Piefort Proof Set – 4 Coins 1 Yuan w/COA & Box – SCARCE SET. Contains 4 pied forts representing. All 4 pied forts are with the 1 Yuan denomination. All four pied forts are encapsulated. The pied forts are housed in a ruby red box with a white satin insert on the top lid which states The 1980 China Olympic Committee Piefort Proof Set, Struck by the China Mint, in the Peoples Republic of China. The following documentation is also provided. One COA from the ICC Company dated June 1980.