I suspect the B addition stands for Busch, so they split their last name. But I'm not 100% sure. Maybe someone else has details about that?
I learned that B.S.B stands for Benjamin Schimmelbusch from the Dutch site below (unfortunately this is only partially accessible).
https://www.sabels.net/?view=category&id=16
It is also mentioned on this site, also in Dutch by the way.
https://wapensverzamel.blogspot.com/2019/01/