[ATTA any specific reason why? Melt value is only a few $ yet the coin has a nice luster one knick on the reverse. CH=full]888308[/ATTACH]
Looks like it was in the same set as the toned half you have it the other thread. Most folks here like it when pictures are taken with the orientation in a portrait position with the top of the bust at the top of the frame...same for the reverse. Also load as full image instead as thumbnail as it is easier to get a good look at it.
64D has the highest mintage of all the silver Washington quarters. They aren't exactly scarce. Yours looks rather "soft" in some of the details to me. Looking at "IGWT" and "UNITED" for example. Looking at numismedia, MS64 is about 10 dollars. I don't think yours is quite that high.
Unless it is a Type C reverse, it's a $3 coin. As for grade maybe AU-55. As was mentioned this is not a rare coin. If you like it and think it is MS, and plan on keeping it, you will get years of enjoyment for you $10. Eventually silver will go up and so will the value of this coin. The grade is not really important as it is not worth being professionally graded.