Here are some factors that can affect the value of a 1972 silver quarter:
* Mint mark: 1972 quarters were minted at three different facilities: the Philadelphia Mint, the Denver Mint, and the San Francisco Mint. Quarters with the "S" mint mark (for San Francisco) are generally more valuable than those with the "P" (Philadelphia) or "D" (Denver) mint marks.
* Condition: The condition of a coin is an important factor in determining its value. Quarters that are in uncirculated condition, meaning they have never been spent, are worth more than those that have been circulated.
* Rarity: Some 1972 quarters are rarer than others. For example, the "Proof" version of the 1972 quarter, which was produced for collectors, is rarer than the "Business Strike" version that was released for circulation.
If you have a 1972 quarter and are interested in finding out its value, you can take it to a coin dealer or appraiser. They will be able to assess the coin's condition and rarity and give you an estimate of its value.