M1 helmet with a mysterious insignia

[GoodOldGermany]

Hi guys, im new here. I bought a M1 helmet (WW2) with an insignia on left side. Can anyone tell me anything about? (disvision?, infantry?), Thx and regards from germany

[Walkwolf]

First thing that came to mind is Spanish. Lol - just enough
missing to stump me. Looks familiar however. Seems to
have had a large crown at the top.........

[GoodOldGermany]

Hello Steve, ty for answering. Yes its a small rest. The history ate a big part of it. Lol. But I hope someone can find the answer. The symbol with the white cross looks Danish. I looked in all of my books, but didt find an insignia like that. ;(