Am I missing something? Most Nickels old and new have two "line" abbove the doorway in Monticello. One line formed by the bottom of the triangle or pyramid and the other line formed by top of the door way (the header so to speak) But I have been putting aside for a few years ones with three lines. Its spoiradic and I do not see a pattern other than I have nickels from the same dates with both displays. can someone explain?