I just returned to coin collecting and was placing some of my coins in 2x2's and when I placed a 1934-D
Mercury dime in the holder and went to staple it I noticed that the front did not exactly line up with the back ( or vice-versa ). When the reverse image is exactly verticle and the coin is flipped--the obverse image is off by approximately 10-15%. I AM NOT familiar with error coins and as such this question may have been asked before but since I am new--please try to fill me in on this variation. Thanks