I've discovered a difference.. It appears the Dukes and Kings of the German states used banners of arms like most royal lines, but the actual state flag was quite simple, usually a bicolor.
Kingdom of Bavaria
Kingdom of Saxony
Duchy of Hesse
Kingdom of Prussia
Kingdom of Hannover
Principality of Anhalt
Kingdom of Bavaria
Kingdom of Saxony
Duchy of Hesse
Kingdom of Prussia
Kingdom of Hannover
Principality of Anhalt
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