https://s-media-cache-ak0.pinimg.com/564x/19/32/cd/1932cd5c2b7c5fff739d7ad271d2f056.jpg
Above is the link to a painting of France surrendering to the Black Prince in a battle of the Hundred Years War. I was wondering about the legitimacy of the armor the Black Prince (right) is wearing/holding, I noticed he is holding a helmet along with what he's already wearing. I apologize for the vagueness. I am on a phone and it's difficult to navigate between tabs.
The type of helm he's holding is a great helm typical of the period and used through to the 14th century and later in jousting and was worn over lighter helmet's of ether metal or fabric.
As for is it a real helmet, yes hear is a picture of it https://myarmoury.com/images/features/pic_spot_ghelm11.jpg
Sorce: https://myarmoury.com/feature_spot_ghelm.html
Edit: becuase I forgot to add a picture of the Great Helm