1. 1915 Barber Half Dollar:
* Condition: Good (G): $1 to $20
* Condition: Fine (F): $20 to $40
* Condition: Very Good (VG): $40 to $75
* Condition: Extremely Fine (EF): $75 to $150
* Condition: Uncirculated (UNC): $150 to several hundred dollars (depending on the quality)
2. 1915-S Barber Half Dollar (San Francisco Mint):
* Condition: Good (G): $20 to $40
* Condition: Fine (F): $40 to $75
* Condition: Very Good (VG): $75 to $125
* Condition: Extremely Fine (EF): $125 to $200
* Condition: Uncirculated (UNC): $200 to several thousand dollars (depending on the quality)
3. 1915 Panama-Pacific Commemorative Half Dollar:
* This coin was minted to commemorate the Panama-Pacific International Exposition in San Francisco. It was designed by Robert Aitken.
* Condition: Good (G): $30 to $50
* Condition: Fine (F): $50 to $75
* Condition: Very Good (VG): $75 to $125
* Condition: Extremely Fine (EF): $125 to $200
* Condition: Uncirculated (UNC): $200 to several thousand dollars (depending on the quality)
It's important to note that the values mentioned above are approximate and can vary depending on market conditions, availability, and the specific condition of the coin. To obtain a precise valuation, it is recommended to consult a professional coin dealer or numismatic expert.