WW2 FREE FRENCH ADRIAN HELMET,LARGE SIZE! | eBay

Been looking for an Adrian and encountered this on eBay. For a WWII era helmet I would generally consider this price high especially given the missing cockade, but I was curious about the Free Frenchicon marking on it.

Any comments on this? Seems like something that could have been added a later date, possibly half a century ago, and due to general aging just looks old. I am always careful about relatively rare items that could be easily reproduced and look authentic. I'd appreciate sources for further research if you have them. If it is legit, any suggestions on price?
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