Certified Brown Percentage: 17%
Certified Red and Brown Percentage: 61%
Certified Red Percentage: 18%
Certified Cameo Percentage: 4%

According to Rick Snow (2014), the Mint used two pairs of dies to produce 1,817 Proof cents in 1904. Interestingly, both are Misplaced Date varieties, Snow-PR1 with the top of an errant 9 in the denticles below the primary digit.

The example to the left was sold by Stack's Bowers Galleries in the August 2019 Rosemont ANA Auction, where it realized $7,800.