Hello, i just buy this .... firemen helmet?

Front side, there’s 3 hole for placing the badge?

The comb

The liner similar with American liner?

The liner backside.

The remain of liner strap

Comb screw

Rear seam

Chinstrap holder using british style?

Old paint (blue)

And during browsing I found these photos in the biak museum in papua
Check the far right helmet

That helmet is similar with my helmet.
And I try to photograph my helmet on the same angle.

And it’s same, especially the comb screw rivet hole and the rim style.

So my question is, what’s this helmet? Is it American made? Is it civilian or military helmet?

Thank you in advance.