1937 Penny:
- Very Good (VG) condition: $0.10 - $0.20
- Fine (F) condition: $0.20 - $0.30
- Extremely Fine (EF) condition: $0.30 - $0.40
- Uncirculated (UNC) condition: $0.80 - $1.20
1939 Penny:
- VG condition: $0.12 - $0.25
- F condition: $0.25 - $0.35
- EF condition: $0.35 - $0.45
- UNC condition: $0.50 - $1.00
1940 Penny:
- VG condition: $0.10 - $0.20
- F condition: $0.20 - $0.30
- EF condition: $0.30 - $0.40
- UNC condition: $0.30 - $0.80
These values are just estimates and can vary depending on the actual market conditions and the specific characteristics of the coins. For a more accurate valuation, it's recommended to consult reputable coin dealers or reference reliable coin price guides.