Another coin I think might be interesting. Is this an error or mechanical doubling on this 1992 Lincoln cent?
"Strike doubling, (which is the result of die-bounce [due to vibrations in the press] and occurs within the split second after the coin is struck), will typically show as flat shelf-like extensions of the doubled characters; there will be no open field areas in-between the doubled images" From: https://koinpro.tripod.com/Articles/1958DoubledDieCent.htm