I have a 2004 copper plated zinc Proof cent, magnet does not stick. I have 2 Charlton Standard Cat. 2013 and 2020 neither book show a Proof 2004 cent. Now if it was a 2004P then yes it would be a Proof.
Ok so the 2013 volume 2 Cat. has " 8 coin proof sets 1997-2011" for 2004 it lists 3 different sets, so it came from one of those. Too bad some one broke the set up, good for me I got it for $3.50
Some folks break up the sets to get certain pieces. Must not have wanted/needed the cent. Nice buy. Page 70 of the 2022 v1 Charlton lists it at $10 CAD.
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