Hello unknown,
you are right : My buettners also with Umlaut came from Silesia (Schlesien).
I am anxious to learn more. Do you have pis of your Gladbeck Buettners?
My mother is nee Buettner.
Who are you?
It's rather uncommon not to sign requests in this list.
Courtesy!
Have a nice day
Fred (Szodruch)