Description in comments

Clockwise from top left - 1797 large size cent, 1825 large size cent, 1844 large size cent, 1853 large size cent, 1875-S 20 cent piece, 1856-O (for New Orleans) half dime (different from the nickel, made of silver), bottom coin is 1829 half cent, upper coin is 1865 3 cent nickel, 1853 3 cent silver, and 1868 2-cent piece.

There were 3 cent nickels????

Yup- made and introduced after the Civil War since people were hoarding silver, like the already established 3 cent silver coins. And the 20c is unique because the only reason they made it is because of a bunch of silver lodes in NV, and they couldn't think of anything else to do with the silver.