1879 Liberty Seated Half Dollar. Proof-66 (PCGS).;This fully struck, expertly preserved 1879 Proof half dollar offers wonderful rich, even, charcoal-copper and olive-gray patina. Also of note is a reflective finish and iridescent undertones of vivid gold and pink. Superior quality Proof survivors enjoy heightened numismatic demand due to the low mintage status of the circulation strike 1879 half dollar.;