1. Mint Mark: There are three different mint marks associated with the 1917 US dime:
* No Mint Mark: The dime was minted in Philadelphia.
* "D": The dime was minted in the Denver Mint.
* "S": The dime was minted in the San Francisco Mint.
Generally, dimes with mint marks have higher values than those without mint marks. Dimes minted in San Francisco (with the "S" mint mark) tend to be the most valuable.
2. Grade: The condition or grade of the dime greatly impacts its value. The grade is determined by evaluating various factors, including wear, luster, strike, and surface preservation. Common grading systems include the Sheldon Grading Scale (from 1 to 70) and the Professional Coin Grading Service (PCGS) or Numismatic Guaranty Corporation (NGC) grading scales (usually on a scale of 1 to 70 or 1 to 100).
3. Variety: There are no known major varieties or errors for the 1917 US dime that significantly affect its value.
Considering these factors, here are approximate value ranges for the 1917 US dime based on condition and mint mark:
* 1917 Dime (No Mint Mark) - Fine/Good Condition: $1 to $5
* 1917 Dime (No Mint Mark) - Extremely Fine Condition: $7 to $15
* 1917-D Dime (Denver Mint) - Fine/Good Condition: $6 to $10
* 1917-D Dime (Denver Mint) - Extremely Fine Condition: $18 to $30
* 1917-S Dime (San Francisco Mint) - Fine/Good Condition: $7 to $15
* 1917-S Dime (San Francisco Mint) - Extremely Fine Condition: $25 to $50
These values are general estimates and can vary based on actual market conditions, coin rarity, and demand among collectors. If you have a 1917 US dime and want to determine its exact value, it's advisable to consult a professional numismatist (coin expert) or use coin price guides for more accurate pricing information.