This is a six-color circular patch with a red border surrounding both sides of a yellow ring.  Inside the yellow ring is a white background with a CD 135 Chicago Diamond insulator pictured.  The insulator is light blue outline in a darker blue.  Inside the yellow ring is the name of the club written with green thread: GREATER CHICAGO/ INSULATOR CLUB.  The patch is 4 inches in diameter which makes it the largest circular patch and the second largest overall.

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