1870 Liberty Seated Half Dime. Proof-66 Cameo (PCGS). CAC.This dreamy specimen exhibits mottled cobalt blue and salmon pink peripheral iridescence, the centers dressed in lighter sandy-apricot. Glassy fields support satiny devices, the surfaces expectably smooth for the premium Gem rating from PCGS. Exceptionally well preserved from a mintage of 1,000 Proof half dimes for the date, the highest in the Liberty Seated series since 1861.