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.
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.