A Thousand-and-One Camera Bargains, Catalog 1919-20, Bass Camera Co. (Chicago, IL), dated 1919, ~6"x9", 64pp & 4 unnumbered centerfold
The most unusual aspect of this catalog is not the cameras therein, but the extra, un-numbered and yellow-colored sheet at the centerfold (pages 32a-d below). As common in the Chicago area, this catalog is dated for a two year period.