The stained glass windows throughout St. Xavier’s Catholic Church were produced in 1916-17 by the Munich Glass Company of Chicago.
Two of the large windows in the church have the name of the company scratched into the glass (see photo above). The windows are not actually stained glass, but opaque glass that was painted.
Glass painters used dark brown vitreous oxide and silver stain to paint designs on pieces of colored and/or opaque white glass.
After the kiln firing the pieces were assembled like fragments of a puzzle and connected to each other with strips of malleable lead - called cames - which were fitted and soldered around each piece to create the full window.
The Great Depression virtually stopped the building of churches and the Munich Glass Company, near bankruptcy, was sold to the Drehobl Brothers Art Glass Company of Chicago which is still in business today.
You can read more about the history of company that created St. Xavier’s stained glass windows here -- http://www.slavicvillagehistory.org/CAPSULE%20HISTORIES/PAGES/munich%20studio%20history.htm