1864 Liberty Seated Quarter. Proof-66 Cameo (NGC). Direct lighting reveals halos of vivid cobalt blue, golden-orange and salmon pink peripheral iridescence that are more pronounced on the obverse. Warmer steely-copper patina dominates at most viewing angles and yields to a circular area of brilliance in the center of the obverse. Fully struck with appreciable field-to-device-contrast, this is an enchanting Proof survivor from a Civil War era Liberty Seated quarter date that is highly elusive in circulation strike format.