A progress report on a Philatelic Enigma. Written and presented by John Barwis and Harry Brittain at the 2017 IAP Symposium in London.
The U.S. 24¢ Purple stamp has been a philatelic mystery for 122 years. As explained in the articles below, these stamps are particularly difficult to identify due to the use of different inks, an overlap in distribution, and a lack of printing sources in postal records.
Please use the two links below to enjoy these articles.
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