I have been a long-time member of the ARGE Abarten, the study group of plate varieties of Swiss stamps. To make the ARGE Abarten research more accessible, for each stamp (Zumstein 202 to 1129 – years 1936 to 2004 with corresponding time spans for Pro Juventutes, etc.), I have assembled a table of data about each difference identified for the stamp. There are over 560 different stamps listed. Each file (available in Excel or PDF) contains the entries for one or more stamp. If no plate varieties have been identified for an individual stamp, the associated table is empty.
Dick Hall December 2025
Plate Flaw material overview including an example of how to find information about a specific stamp: Resource Introduction and Navigation 
List of the stamps included in the files sorted by Michel number can be found in Stamp Index
List of the reference material used to develop the Plate Flaw tables can be found in Source Citations
German Language copies of reference materials from which Plate Flaw information was extracted can be found here.