There has been a couple of posting of late dealing with what is the rarest helmet(s). Take a look at these in the photos on this site. If you are not familiar with this site it is very good when dealing with colonial German items.
For some reason I can't get a direct link to the photos, once on the site linked above scroll to bottom of page and click on " Latest Updates to this Website RECENT", then click on" Uniformed German Prisoners in New Zealand 1917."
Anything involving uniforms, cloth headgear and accessories.
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