It appears Ideal School Supply Company has made school supplies since the early 1900's and is currently still in business. This is an envelop of pages entitled BUTTERFLIES TO COLOR by Penny Ross. It is marked IDEAL SCHOOL SUPPLY COMPANY CHICAGO, ILL. The envelop appears to be from the 1920-30 era. Inside are 10 individual pages with butterflies and flowers printed in black outline. These were made to be colored. They are so beautiful, I think they would make a wonderful grouping framed in simple black frames. Each page measures 8 7/8" x 6". The butterflies are: Silvery Blue, Monarch, Queen, Black Swallow-Tail, Dog's Head, Cloudless Sulphur, Silver-Bordered Fritillary, Tiger Swallow-Tail, Sleepy Yellow, Diana Fritillary. The envelop is worn, but the pages are in excellent condition.