I was surprised & happy to find a couple pieces of letterhead in a book at Rose Marie Shuchart’s house.  Rose Marie and her mother, Agnes, worked for our agency.  The letterhead has Donegal Mutual Insurance Company and Bubb Insurance Agency on it.  Note the address for the agency is the Bubb Building and phone # is 4941.  Donegal’s phone # is HAzel 62811-62821. Not sure which decade but an interesting find to be sure!