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fkwPaul's right. The cards you have are 1/4 of a 4-in-1, and the worst part is they are not vintage, they are from the set called "1977 Jim Rowe 4-on-1 Exhibits" on page 317 in the 2006 SCD. Very little value, complete postcard size cards book for $5, but cut are almost worthless.
The difference between these 1977 cards and the authentic 1930's 4-on-1 cards is the caption has a different style font, and there is no black line around the photo like the 1930's Exhibit Supply Co. cards have.