The Chicago Millwork Supply Company, as the name suggests, sold millwork. It’s one of those companies which is interesting, but also frustrating because there is not a lot of information readily available about their history. The company grew, and sometime around 1913 or so (I’m not sure exactly when) they began selling kit houses as well. Their products were no doubt shipped throughout the Midwest, and perhaps beyond.
When an old house in northwestern Kansas fell victim to “nuisance abatement”, the opportunity to salvage it arose. The small house had received several additions over the years, but the core section appeared to date to the early 19th century. When an attic window was removed from the original section, it yielded a fun surprise; the backside of the exterior casing retained an original paper label from the Chicago Millwork Supply Company. I was able to locate the window unit in a 1906 catalog which had thoughtfully been placed in the digital collections of the Thomas J. Watson Library, the Metropolitan Museum of Art.
That catalog image follows, along with photographs of the head of the salvaged window unit: