There were 5 such bunkers on the training ground and they were all in the highest, i.e. III resistance class. Three of them Wrangel, Gneisenau and Scharnhost are artillery observation shelters with a 360-degree observation field and four observation slots. The other two to Lutzow and Yorck which only had 2 slots, or 180 degrees of observation.
A bunker named after Ludwig Adolf Wilhelm von Lützow
pl.wikipedia.org/wiki/Ludwig_Adolf_Wilhelm_von_Lützow