We have to remember the ATC got seperated before the printing of both my beloved T205's and the T207 sets. What we know about 206's means nothing to the other sets. It's only an assumption if we go that way with 0 proof. The fact those cards were pulled out of a wall with 15ct packs is hard to ignore.

Look at the AB's. They changed the pack size but not the card size during 205 distribution. I used to think 205's were somehow a subset of 206's. Like a continuation of some sorts but after a lot of research I believe that the T205,t80, and the other bird issue makes the 400 subjects. Take out the typo variations from the 205 set and add those other gold boarder cards and the number is right at 400. Kinda hard to look away from that.

Collecting and reasearching these types of cards sometimes reminds me of those 3-D pictures. We stand so darn close to them looking for the image or info we forget that sometimes we have to step back to see the picture.

Can the OP post pics of the find?