Lubeck

Hamburg

Bremen

Three separate free cities that had been in a league for trading  since the middle ages. Each city had a regiment in the German Army. (in order of the flags at the right.) They were governed by a city council and had a mayor or head of senate but no princely head and thus no helmets for such. 

Lubeck = 162nd

Hamburg = 76th

Bremen = 75th

Bremen also had a Foot Arty Regiment #9

They were part of 17th division IX Corps.

Remember much of this population base went to the Navy.

The tough part of these guys is that each city had its own land  cockade.  The cockade is the only difference from the Prussian Line helmet. While there are others, more quick fakes of these show up than any else.  Extreme caution should be used when buying these.  Look at my Q&A page for comments. 

Each city donate

Lubeck Cockade IR162

Bremen Cockade IR75

Lübeck, Bremen, Hamburg Officer cockades 

with owner's permission