To Recognize a Denver vs. Philadelphia Mint Coins Newer than 1968, you have to flip your coin to the “face” side that contains an image of a person. After that, find the date. If the date is 1968 to the present, you need to keep the coin on its face and locate the single-letter mint mark with using a magnifying glass if necessary. You must Note that Congress ordered the U.S. Mint to not place any mint marks on coins from the years 1965 through 1967. Then, identify the coin as minted in Denver if the coin bears a D as its mint mark.
Next, identify the coin as minted in Philadelphia if the coin bears a P as its mint mark and has a date of 1979 or newer. You should Note that Philadelphia still does not put mint marks on its Lincoln pennies. Forth, identify the coin as minted in Philadelphia if it bears no mint mark and has a date from 1968 through 1978.