1. Good (G) condition: $0.05 - $0.15
2. Fine (F) condition: $0.15 - $0.30
3. Very Fine (VF) condition: $0.30 - $0.60
4. Extremely Fine (XF) condition: $0.60 - $1.20
5. Uncirculated (UNC) condition: $1.50 - $5+
The "d" mint mark indicates that the penny was minted at the Denver Mint. Please note that these values can fluctuate over time based on market conditions and demand for the coin.
Additionally, there is a rare variety of the 1951d wheat penny known as the "Doubled Die Obverse" error, where the letters and design elements on the coin's obverse (front side) appear doubled due to a minor misalignment during the coin production process. This doubled die error can make the penny significantly more valuable, with prices ranging from hundreds of dollars to even thousands of dollars, depending on its condition and scarcity.