single-sided c. 1920's original heavy gauge stamped yellow brass manufacturer and/or specifications plaque designed and fabricated by or for the clarage fan company, kalamazoo, mich. the diminutive plaque was salvaged from a larger enclosed rooftop air fan or blower unit original to the lakeshore drive athletic club. the plaque contains four small holes for use with copper rivets. the surface patina is mostly uniform throughout.