Obverse Dies: 2 Known
1864 Philadelphia dimes are found well struck and will exhibit surfaces that are typically prooflike or semi prooflike.
Two obverse and reverse dies are known for the 1864 date. Ahwash believed that both busines and proofs were struck from each set of dies. However I have only been able to locate business strikes from one of the die pairs.
Plate Coin: Fortin 102a, Gem Example of Ahwash 2, Fully Struck With Surfaces That Are Exceptionally Clean. Satin-Like Mint Luster and Lightly Die Clashed as Many of This Variety Are.
Jason Carter, sold privately in 7/2007 - Eugene H. Gardner Collection - Heritage 6/2014:30261, $17,625