When souvenir cards are altered from their original form and reissued, these varieties are given a suffix in the SCCS numbering system. These alterations can include modifications such as adding an overprint or an embossed seal. The USPS, the Bureau of Engraving & Printing, and the American Bank Note Company all did this occasionally, and these officially altered cards are given capital letter suffixes (i.e., B-90A and PS-62A) in our system. Such cards can be found in their respective galleries on this site.

More often, however, cards were repurposed or enhanced by organizations or private individuals. This was frequently done by cutting down a card to remove the original show information, then on the front or back, adding the new text for a different event. In the 1990s, the ANA and SPMC had many surplus cards from past shows, and it became a common practice to recycle these semi-official (SO) cards for promotional uses. The Milwaukie Philatelic Society had a long-running series of overprints on various cards, typically released at the Milcopex Awards Banquet. Because the alterations were done "post-production" by unofficial entities, cards like this are cataloged with lower-case suffixes (SO-10a, b, c, etc.). These are the cards found in this gallery.

Special thanks to John Wilson for supplying many examples of altered ANA and SPMC cards, a significant number of which he was responsible for creating. There are very likely more varieties to be discovered; we welcome scans and information at SCCS1981@yahoo.com.