In response to Hortus who has commented elsewhere:
Since the breeder has not named this rose, I use " Weiße von Saxdorf " only as a working name.

Think of ‘Weiße von Saxdorf’ as a temporary synonym. As it is a bred rose, it does not carry the “double quotes” of a foundling rose. If ever Mr. Bethke does name it, we can then set ‘Weiße von Saxdorf‘ aside in favour of its permanent name.