I also have an 1867 that came out of the ground in similar condition, probably AU grade, without any corrosion. Sorry, no pic on hand, but it was dug out of wet, muddy soil in a ditch, and by all rights, it should have been a small green chunk of corrosion after 150 years. I also have an 1864 bronze and an 1869 which are almost as nice. I wonder why the cents from these dates apparently resist corrosion better than those minted in later years?