How can I know what a 1921 peace dollar looks like?

All Peace dollars have the same design. The difference between the 1921 Peace Dollar and the 1921 Morgan dollar is that Liberty looks completely different. In the more common 1921 Morgan dollar, Liberty wears a crown with the Word "LIBERTY" on it, on the reverse of the Morgan dollar, there is an eagle with olive branches and arrows in its talons along with a wreath under it. On the Peace Dollar, Liberty looks like she has rays coming out of her head and on the reverse there is an Eagle sitting on a rock inscribed "PEACE", there is no wreath on the reverse.