1915 Lincoln Penny ("wheat penny"):
- Good (G) condition: $0.10 - $0.25
- Very Good (VG) condition: $0.30 - $0.50
- Fine (F) condition: $0.60 - $1.00
- Very Fine (VF) condition: $1.25 - $2.00
- Extremely Fine (XF) condition: $2.50 - $4.00
- Uncirculated (UNC) condition: $5.00 - $20.00 or more, depending on the specific mint mark and variety
1915-D Lincoln Penny (Denver mint mark):
- Good (G) condition: $0.20 - $0.40
- Very Good (VG) condition: $0.50 - $0.75
- Fine (F) condition: $0.80 - $1.25
- Very Fine (VF) condition: $1.50 - $2.50
- Extremely Fine (XF) condition: $3.00 - $5.00
- Uncirculated (UNC) condition: $10.00 - $30.00 or more, depending on the specific variety
1915-S Lincoln Penny (San Francisco mint mark):
- Good (G) condition: $0.25 - $0.50
- Very Good (VG) condition: $0.60 - $1.00
- Fine (F) condition: $1.10 - $1.50
- Very Fine (VF) condition: $1.75 - $3.00
- Extremely Fine (XF) condition: $3.50 - $6.00
- Uncirculated (UNC) condition: $15.00 - $50.00 or more, depending on the specific variety
Note that these are just general ranges, and the actual value of a specific coin may vary based on factors such as its rarity, condition, mint errors, and market demand. To determine the accurate value of a 1915 penny, it's best to consult a professional coin dealer or refer to a comprehensive pricing guide.