Historical clue formulations

• Knockoffs, informally — 2020-06-10
• Copies, informally — 2017-01-22
• Mag proofs — 2013-11-10
• Not originals — 2011-02-08
• Dupes — 2008-08-13
• They're not original — 2008-05-27
• Dupes — 2008-03-29
• Prints — 2006-04-09
• Copies — 1997-11-08