This typewriter, called "The Chicago," was a rare, compact machine manufactured between 1898 to 1912, and a further development of the "Munson" typewriter, introduced in 1890. The Chicago has an unusual, non-QWERTY three bank keyboard with black ink on white plastic keys. Note the position of the ribbon and the horizontal printing type wheel in front of the rubber impression roll, and the small printing hammer directly center and back of the rubber roll. As keys are depressed from the keyboard, the printing wheel moves left or right to the correct position of the letter struck, and simultaneously the printing hammer strikes on the back of the paper forcing it against the printing wheel for an impression.