I have quite a few 1964 D dimes in the hoard and I have two pointed tail 1964 D Roosevelt dimes. The only thing I have been able to research was that the differences between the two is the rounded 9 was minted in the early part of 1964 and the blunt 9 came after a hub redesign later that year. Is this correct? Neither the rounded 9 or the blunt 9 in the business strikes are worth much more than melt but the two rounded 9's are pretty nice examples. The fourth pic is from the blunt 1964 D version.