The mint mark on a 1942 Franklin half dollar can also affect its value. A 1942 Franklin half dollar with a "P" mint mark (indicating that it was minted in Philadelphia) is worth more than a 1942 Franklin half dollar with an "S" mint mark (indicating that it was minted in San Francisco). A 1942 Franklin half dollar with a "D" mint mark (indicating that it was minted in Denver) is even more valuable.