News and articles
Read the article published by the New York Post on September 6, 2018, An Inverted Jenny Surfaces. The Flawed Stamp Had Not Been Seen Since 1918.
https://www.nytimes.com/2018/09/06/nyregion/inverted-jenny-stamp.html
Also, consult the most recent publication from our member Jean-Pierre Hoesli on the color of stamps. Jean-Pierre will give a talk on the subject on Monday October 1st at the meeting.
Articles published by APO members
L'identification de la couleur d'un timbre, par Jean-Pierre Hoesli
Germania, une introduction à un timbre banal et extraordinaire, par Jean-Pierre Hoesli
Les timbres CFF, par Jean-Pierre Hoesli
Les timbres CEPT et Europa, par Annette et Jean-Pierre Hoesli
Indonesian Stamps, mirrors of political turmoil, 1945-1949