1878 Trade Dollar. Proof-62 (ANACS). OH.This smartly impressed, predominantly mauve-gray example reveals vivid lilac-blue undertones and appreciable reflectivity as the surfaces dip into a light. The first of the Proof-only issues from the final years of the trade dollar series, the 1878 has a mintage of 900 coins. Survivors are eagerly sought by both specimen type collectors and trade dollar enthusiasts.