The 1964-D is common in circulated grades up to MS64. In MS65 they are a little harder to find but probably many still in original and even opened rolls. In MS66 condition they become scarce with possibly under 1,000 available combined between raw and certified examples. There are probably more in original rolls but getting harder to find. There are probably very few if any at all in opened rolls as these are usually pulled out and sold as singles or are sent in to be graded. In MS67 it is one of the tougher dates from the 1960's especially from the Denver Mint. Less than two dozen are known in MS67 condition with none being graded higher.