The 1906 luster appears to be broken in the fields and there is apparently wear/rub on the high points.
1946 - I'd call that a *very attractive* MS-64. 1906 - Very low AU. Definitely circulated, no question. Noticeable wear on all high points, dulled luster in the fields. Classic AU appearance. Depending on amount of luster remaining, might even go as low as EF.