A fantastic German WW1 M18 helmet which was worn with the Reichswehr and comes with a painted Prussian decal.

Hard to read maker mark and 64. Lining size about 58-60.

"AK" ink marking to the reverse. Typical 3-part leather lining attached to its metal ring. One pocket with a rip. The chin strap in place. Original cord. 

Shell has one Prussian emblem and is dedicated to “Lindemann Oberstleut” in period white paint.

The later Generalleutnant Georg Lindemann had an interesting career and was the 275th Oak Leafs recipient during WWII.
Extremely rare!

Please see last pictures for Scans original of photos showing Lindemann. 

There is one where Lindemannl seems to be wearing a WW1 M18 type helmet with a white cloth helmet cover. The shape of the shell and the quick-release chinstrap of the M18 type - which is clearly visible - is so obvious, that it's highly likely he's wearing he's old Reichswehr period helmet. In another picture, again, he's wearing an old style helmet with the air vents sticking out. 
Lindemann is the only Prussian officer with that name and Oberstleutnant rank inscribed in the skirt of the helmet in the time of the Weimar Republic, to which he was promoted in 1931, so there is no doubt this helmet belonged to him. The fact that he continued to serve in the Wehrmacht and that he rose to the rank of Generaloberst is a great achievement, and being a Knight's Cross and Oakleaves recipient further enhances his reputation as a successful military leader.