Obverse Dies: 3 Known
For 1865 San Francisco coinage, three obverse and reverse dies were used, one of the reverse dies being "left over" from 1861. These die produced five different obverse/reverse pairings.
In general, 1865-S dimes are typically seen with flat heads and a weak mintmark. This observation can be explained by the higher availability of Variety 101. Locating an example of Variety 101 with a full head could take years.
Finding AU or better 1865-S dimes in choice original condition could take years of searching. Most examples seen have been cleaned, though the grading services still certify some examples in this state of preservation.
Plate Coin: Fortin 101, White and Well Struck, Extremely Rare Full Head Example in a Condition Census Grade, Formerly Eliasberg Collection