The Morgan Dollar is likely the most recognized rare coin to average people on the street.
They are sold circulated as a “survival” coin and silver related investment. In uncirculated form they are sold by the Roll, 20 coins as well as individually graded coins. They are very popular in MS-64 and MS-65s.
The were minted in the hundreds of millions. Morgans are perhaps the most common “rare coin”. In higher grades they have lagged the price of silver severely.