Turns out both of these things were true for the part of the job that involved the window over the sink.
The plan was to remove the window sashes and replace them with two 46 inch high windows and raise the sill up about 12 inches.
It is actually metal. As you can see, the business was called, THE STANDARD STEAM LAUNDRY CO.. and was located at 7110.12 on South Broadway in St. Louis, MO. The telephone numbers listed were: South 133 A and Kinloch Victor 942.
It also lists the President and Manager as: Guido A. Doering. The Vice-President as: Wm. J. Johnston and the Secretary and Treasurer as: Geo. S. Johnston.
On the bottom left of the card it says; Strictly First Class Work Guaranteed
Someone wrote a note on the card but it is difficult to read. It looks like someone's name followed by the numbers, 2657.
The backside of the card was not left blank as you can see here.
It shows a twelve month calendar from July-December of 1904 and continues from Jan.-June of 1905.
The card was printed by Aluminum Mfg. Co. of Two Rivers, Wis. U.S.A.
So, about that window....it's still right where you saw it pictured. Other things have taken precedence. Stay tuned for the next episode.