The reverse depicts a train dramatically moving in front of the Colorado Rocky Mountains, along with text in English and Chinese commemorating AMERICAN NUMISMATIC ASSOCIATION DENVER 2017, WORLD’S FAIR OF MONEY. — Each commemorative contains cupronickel, brass and copper, and is 30mm in diameter, round shaped.
Is it proof or selectively finished? Looks like the black parts of the panda are mirrored. Or is it colored?