From the Peoria Journal Star is some more information on the former Haeger factory at 411 W. Calhoun St. which closed in October 2004. “The factory was more than 100 years old. It came back from at least one devastating fire and had operated under the Haeger name since 1939.”  “Manufacturing of the company’s pottery lines was shifted to another plant in East Dundee.”

I ran across a website with an extensive list of pottery & porcelain marks.  For me it will be the US marks, but there was several other countries that were well represented.  The marks look like they were mainly before 1900.