Old handwriting

In a few spots in our home, I found old handwriting on the wood!

In the upstairs sewing room closet door on the inside, I found this:

It appears to read Wm. G. Faye Mfg. Co, St. Louis, MO (feel free to correct me if I'm wrong)

And from the basement, there's a hole cut under the grand staircase and on the stair treads I found boards with writing on them as well: