The placement of mintmarks on Liberty Seated Dimes varied over the years. From 1838 to 1860, the mintmark appeared within the wreath on the reverse. When the design changed from the Stars Obverse to the Legend Obverse in 1860, the mintmark began to appear below the wreath. However, there are three exceptions to this rule: 1860-S Dime; 1875-S; and 1875-CC. On the 1860-S Dime, the mintmark is always within the wreath; on the 1875's, the mintmarks appear either within the wreath or below the wreath.
Between the two major types of 1875 Dimes, the Mintmark Above variety is slightly more common than the Below Wreath variety, but only by a small amount. Ample amounts of the Mintmark Above varieties exist in Mint State, to the tune of almost 200 coins (minus some resubmissions). The best examples top out at MS67.
Gerry Fortin has identified nineteen different die varieties for this year.