Where is the mint letter on 1937 nickel?

The mint mark on a 1937 nickel is located on the reverse side of the coin, specifically to the right of the Monticello building. If the nickel was minted in Philadelphia, it will have no mint mark. If it was minted in Denver, the mint mark "D" will be present, and if it was minted in San Francisco, it will have an "S."