1. 1931 -S Wheat Penny  The 1931 S Lincoin Wheat Penny is a key date in the series, only 866,000 coins minted. Last penny minted at the San Francisco Mint until 1935.

This Coin had a mintage of 1,825,000

The 1914 –D Lincoin Wheat penny is another key date in the series. This coin is the most valuable non error penny. With a mintage of 1,193,000 it has one of the lowest mintage in the wheat cent series.