click and then zoom for larger image to read label
In architectural conservation class, my professor showed my class some old sheetrock from a historic house in Vermont. Normally we don’t count sheetrock as anything but modern, but the label here says 1921! Anyway, maybe you find this label as interesting as I do. Enjoy!
Preservation in Pink 
I found a label in an old wall in Garden City, TX for Gypsolite wallboard by U.S. Gypsum and Lime Company. I am wondering what age it is. The house is presumed built in the late 1800’s and has been added to and remodled several times. When I was tearing out an origional long-leaf wall, a piece of sheetrock fell out of the wall with the label on it. The label is tattered but still mostly readable. I’m wondering if it is rare enough to be of value to the company for historical or preservation sake?
Justin, I don’t have an answer to your question, but if you send a picture I’m happy to post it and maybe we can come up with an answer. Thanks for reading.