Hi and Welcome to the forum!
This is a fantasy coin intended to fool some people. Probably silver or gold colored. The indian head design similar to the indian cent of 1859 -1909 was not yet in use and I doubt had been even designed. The font is wrong for the time, "United States of America" only appears on one side of a real coin, rough features and texture, all scream non-mint. If you google "1851 dollar indian cent design" other photos and other forums have seen these occasionally, and come to the same conclusion. It is not a "trial" or "pattern" piece. It is a "fun" coin
Jim
