Based on its 2014 price guide, CoinStudy.com values a 1906 Barber dime at between $2.87 and $187, depending on its mint mark and its condition. Many coin collectors grade a coin's condition on a scale of good, fine, extremely fine and uncirculated.
The most valuable uncirculated 1906 Barber dimes are those produced by the San Francisco mint facility, and they contain an "S" mint mark. The second-most valuable mint mark is the "O," signifying New Orleans, with an uncirculated dime valued at $161. Uncirculated 1906 Barber dimes carrying the Denver mint mark are worth $133, and those from Philadelphia are worth $109.