On the 1943 steel penny, the mint mark can be found just below the date: "D" represents the Denver Mint, "S" stands for the San Francisco Mint, and no mint mark indicates the Philadelphia Mint.

1943 D Lincoln penny Fine F-12 to F-15 217,660,000 $0.39 1943 D Lincoln penny Extremely Fine XF-40 to XF-45 217,660,000 $0.50 1943 D Lincoln penny Uncirculated MS-60 to MS-62 217,660,000 $3.30 ...