Heteny late roman helmet is ready.

[Flavivs Aetivs]

I think they copied the nose guards of 5th century Baldenheims, which have a slight ridge and are sometimes attached to the Helmet in the same manner.

Yes, maybe the cut-outs in the bowl where the nose guard might have been attached. I must say I have never seen one of those nose guards and I thought they were from the 6th c. CE.?

Some date to the 5th century, but most date to the 6th. The Baldenheims themselves have a built-in noseguard (tit's not riveted on and doesn't extend down the face) but some of the other spangenhelmets of that era do have noseguards.

Baldenheim:
http://www.slovane.cz/pic/zebrovky/16.jpg

Can't find any images of it, but there's one 5th century spangenhelm that has the ridge on the noseguard.

As for the crossover cheekpieces, that's part of what inclines me to believe it's a fake.