The Proof mintage for this issue is up in the air, as the Guide Book and the Snow reference (2009) each give an estimate of 370 pieces, but the Bowers reference on the series calls for an estimated 800 to 1,000 pieces. Mintage presumptions aside, the 1864 Copper-Nickel cent is a bona fide rarity in Gem Cameo Proof. Only a single die marriage is known, a second variety with repunching to the digits 86 in the date reported by Breen remaining unconfirmed.

The example to the left was sold by Stack's Bowers Galleries in the Winter 2022 Showcase Auction, where it realized $6,600.