Here are some factors that can affect the value of a 1920 silver dollar:
* Condition: The condition of the coin is one of the most important factors in determining its value. Coins that are well-preserved and have a high level of detail are worth more than those that are worn or damaged.
* Rarity: The rarity of the coin also plays a role in its value. Some 1920 silver dollars are more rare than others, and these coins can command a higher price.
* Mint mark: The mint mark on the coin can also affect its value. Coins that were minted at the Philadelphia Mint (no mint mark) are more common than those that were minted at other mints, such as the Denver Mint (D) or the San Francisco Mint (S). Coins with a rare mint mark can be worth more than those without.
* Variety: There are several different varieties of 1920 silver dollars, and these can also affect their value. Some of the most notable varieties include the "Draped Bust" variety and the "Liberty Bell" variety.
If you have a 1920 silver dollar, it is a good idea to have it professionally appraised to determine its exact value. An appraiser can take into account all of the factors mentioned above and give you a fair and accurate estimate of the coin's worth.