1. Barber dime (no mint mark):
- Worn/heavily circulated: $1.50 - $2.00
- Fine: $2.50 - $3.00
- Very Fine: $3.50 - $4.00
- Extremely Fine: $5.00 - $6.00
- About Uncirculated: $7.00 - $8.00
- Uncirculated: $15.00 - $20.00
2. Barber dime (with "O" mint mark):
- Worn/heavily circulated: $2.00 - $2.50
- Fine: $3.00 - $3.50
- Very Fine: $3.50 - $4.00
- Extremely Fine: $4.50 - $5.00
- About Uncirculated: $5.50 - $6.50
- Uncirculated: $10.00 - $12.00
Please note that these values are rough estimates and may vary based on market conditions and the specific details of the coin. Consulting a reputable numismatist or checking recent auction results can provide a more accurate assessment of a 1900 US dime's value.