Amazing stuff everyone!!
Here are my two that should fit the criteria.. my 1922 Eastern Exhibit Black and White postcard stock (unsure of population as I believe these are lumped in with population of all 1922 Easterns'), and 1927 Babe Comes home fan photo - one of the auction houses stated a few years back that there were 3 or 5 known but I don't know how accurate that is..