Proof 1877 New Currency issue, die proofs (4, approx. 92x60mm.) in black of the 32c. (2, one unmarked, the other dated "Apr 19 1877" and marked "BEFORE HARDENING"), and 64c. (2, one dated "Apr 12 1877", the other dated "Apr 18 1877" and marked "BEFORE HARDENING"). Fine