Hohenzollern-Sigmaringen – Flag in Lexicon and Shop https://www.flaggenlexikon.de/fdthohes_me.htm
The Principality of Hohenzollern-Sigmaringen existed between 1623 and 1848. It became part of the Prussian administrative district of Hohenzollernsche Lande in 1850. The flag showed the colors black and white.
IV. receives Hechingen 1411 · the Margraviate of Brandenburg