largely intact and all original remarkable early 20th century highly sought after double-sided bell telephone "booth inside" flush mount flange sign likely designed and fabricated by the burdick sign company, chicago, ills. the cold-rolled steel porcelain enameled sign was discovered in a chicago city dump during the summer of 2015. the largely intact steel sign remains in good overall condition, considering the fact that the sign was tossed into a city dump a hundred years ago. the early cobalt blue color is both vibrant and faded in various areas on each side. the bell telephone co. of illinois was chartered in 1878; three years later, it became part of the chicago telephone co. by the beginning of the twentieth century, chicago telephone was associated with the bell network of american telephone & telegraph co. (at&t), the largest phone company in the united states. the number of chicago-area telephones served by this company grew from 34,000 in 1900 to roughly one million by 1930. by the early 1920's, chicago telephone employed about 16,000 people in the chicago area; many of these employees were female operators. illinois bell continued to grow in the decades that followed, until it had roughly 36,000 chicago-area employees by the early 1970's. after federal courts dismantled at&t's bell system in 1984, illinois bell became the largest division of ameritech, the new, leading telecommunications company in the midwest. at the end of the 1990's, when it employed about 20,000 people in the chicago area and collected nearly $20 billion in annual revenues, ameritech was purchased by sbc communications inc., another giant phone company and former “baby bell.” at the turn of the new century, the executive offices of the corporation serving most of the phone customers in the chicago area were now located in san antonio, texas. measures 15 x 10 1/2 inches.