The total number is well over a thousand. I began with a modest page on them early in the GPA, but I kept buying more, and collectors send me images of others. The collection grew from one page to two — and now I am splitting it into more pages. The index page provides full details. Although a comprehensive listing is probably impossible, but my collection is the most comprehensive available.
Gau Oberdonau, November 1938
If you have ones I do not have, I welcome assistance in building the collection.