I was curious if there really is such an error as a "thin planchet error." I ask because I found a 1940 S wheat cent in a lot I was sorting out, and it somewhat resembled the coin in this thread:
http://www.cointalk.org/showthread.p...highlight=acid
However, it doesn't have that 'acid' look with all the pitting. It's worn, probably VG-F details, but not evenly smooth, and a nice light brown color. I guess it could be an acid job that made it's way back into circulation, but I'm not entirely sure if that's the case.
What would really resolve this is knowing whether there IS such a thing as a thin planchet error. If not, well, then it must be an acid job or one of those shaved-down pennies made to work like a dime!
Thanks in advance!