The Missouri 2X4 is one of the key issues in the silver commemorative series. (See my narrative for the "plain" Missouri...coin #9330...for the story of the Missouri issue and the controversy over their mintage figures.) Missouri 2X4s range in grade from AU to MS65 on average. The MS65s are rare and Superb Gem MS66 examples are very rare. Missouri 2X4s can be frosty or toned. Frosty, original examples are definitely the exception. And the toned Missouris can often be dull and unattractive. The premium specimens are the frosty white or the attractively toned pieces.