I found something like this for sale on a Ukrainian portal.

[Naprawiacz]

Original Vintage German Prussian WWI Spiked Pickelhaube Helmet with Original Liner





"Fine original German Prussian spiked Pickelhaube helmet, worn by the German military around WWI. The helmet features a gilt eagle ornament holding a scepter and orb. The eagle has the letters "FR" on it and reads "Mitt Gott Fur Koenig Und Vaterland" which translates to "With God for King and Fatherland". The helmet also has a detachable spike. The helmet comes complete with the original liner that is intact and in good condition. The helmet is in very good condition with only some light wear to be expected with age."

 

[911car]

Nice helmet. And very rare. There is one like this, but without the eagle plate, pictured in JL Larcade's book "Casques a Pointe", vol.1.

 

[coert65]

To me, it looks like a modified M42 stahlhelm.
But then again, I am no expert on these.

 

[Naprawiacz]

To me, it looks like a modified M42 stahlhelm.
But then again, I am no expert on these.

I wonder, Coert, whether to buy one of these to improve the mood? It's always some variety.

 

[Winston1]

It reminds me of that bagpiper in the trench warfare scene from War Horse (2011).