United Nations Educational, Scientific and Cultural Organization World Heritage International Coin Program Commemorative coin $20 Silver Proof Key selling points: Official UNESCO licensed collection; Official legal tender coin; Coin bears the official UNESCO temple logo mint mark. Exceptional design; PAMP is pleased to present the new 'Wood Buffalo National Park & Sichuan Giant Panda Sanctuaries' commemorative legal tender coin. Issued by the Royal Canadian Mint, the new release celebrates two remarkable UNESCO World Heritage sites through a single coin. Metal Weight Diameter Quality Face Value Year Date Mintage Silver 999.9/1000 31.39 gr 38 mm Proof 20 DOLLARS 2015 Max. 7.500 Wood Buffalo National Park & Sichuan Giant Panda Sanctuaries Embargo date 5 th MAY 2015