1960 D Roosevelt doubled D

Wolf

I recently purchased a roll of 'original' 1960-D dimes. After opening them I found 8 of the 50 coins with a die crack in and behind Roosevelt's head at about 2 o'clock. The D mint mark appears to be doubled on all eight of these coins does anyone know anything about this variety and or its value? here is the doubled d. Thanks image

clw54

I've seen doubled Ds on a 1964-D also.