When you see "doubling" on both the date AND mm, that's a pretty good indication that it's machine doubling. [sometime in the 90's, the mint starting putting the mm on the hub so this trick isn't useful after that]
1990, at least for cents. Even if the coin isn't what the OP had hoped, it's certainly good that he's noticing such things and training his eye in the process.
Some of it looks like die deterioration doubling to me. Note that the lines of the date and mintmark are irregular. Chris
