Glider pilot helmet

[axion9]

Hi!
A friend of mine got these pictures of a flying helmet and asked me to help him. I am not sure about this one.
Is this a glider pilot helmet? Any idea how rare they are and if they are worth much? Never seen one for sale before.
Thanks in advance.
Regards k-J

[axion9]

pics

pics

[axion9]

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a

[axion9]

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[Jos L C]

It's a NSFK / HJ flight helmet ..

Here's another one ..

http://www.hermann-historica.de/aukt...db=kat67_x.txt

Jos.