1. Mint Mark: 1964 US quarters were minted in three different locations: Philadelphia (no mint mark), Denver (D), and San Francisco (S). Quarters with the "D" or "S" mint marks tend to be more valuable than those minted in Philadelphia due to lower mintage numbers.
2. Condition: The condition of a coin significantly impacts its value. Coins graded as Mint State (MS) or Proof (PR) by professional grading services like the Numismatic Guaranty Corporation (NGC) or Professional Coin Grading Service (PCGS) generally command higher prices.
3. Rarity: Some 1964 quarters are rarer than others, such as those with die variety errors or limited mintage numbers. Certain errors, such as doubled dies or off-center strikes, can add substantial value to a coin.
4. Historical Significance: Coins that commemorate significant events or anniversaries can have increased value due to their historical importance.
5. Market Demand: The overall demand for 1964 US quarters also influences their value. If there is high demand for these coins among collectors, prices may be higher.
Here are approximate value ranges for 1964 US quarters in different conditions:
- Circulated, Good condition: $0.25 - $1
- Circulated, Very Good condition: $1 - $3
- Circulated, Fine condition: $3 - $6
- Circulated, Extremely Fine condition: $6 - $10
- Uncirculated (MS-60): $10 - $20
- Uncirculated (MS-63): $20 - $30
- Uncirculated (MS-65): $30 - $60
- Proof (PR-65): $50 - $100
Please note that coin values can fluctuate over time based on market conditions. To determine the exact value of your 1964 US quarter, it is recommended to consult a professional numismatist or use coin price guides for accurate valuation.