1. 1931-S Peace Silver Dollar (San Francisco Mint):
* Brilliant Uncirculated (BU): $250 - $350
* Extremely Fine (XF): $180 - $250
* Fine (F): $120 - $180
* Very Good (VG): $90 - $120
* Good (G): $60 - $90
2. 1931-P Peace Silver Dollar (Philadelphia Mint):
* Brilliant Uncirculated (BU): $200 - $250
* Extremely Fine (XF): $150 - $200
* Fine (F): $100 - $150
* Very Good (VG): $75 - $100
* Good (G): $50 - $75
Please note that these values are just estimates and the actual price may vary depending on market conditions, coin rarity, and individual seller or buyer preferences. It's always a good idea to consult with a professional numismatist or coin dealer to get a more accurate appraisal of the value of your 1931 silver dollar.