M1 Helmet Help and Idendification

[joaobr]

What is your opinion about this M1 helmet?

I bought this M1 and it caught my attention because the shell and chinstrps seem to me from the second war. I'm not sure if the painting matches the period.
And its interior seems to me to be a 1965-73 ceiling. I'm not sure about dating the camouflage net and the leather jugular.

I also find it strange to see this leather chinstrps with this liner and I don't know what date it is.
Inside the liner there are some words written. They appear to be: shigoto (or shihoto), holly and holo. The photos were not so good.

Between the shell and the liner this photo was stuck. I took it out carefully and there are some words in Portuguese. The shell and liner were firmly attached as well.

Unfortunately it is not possible to see the part number. Some parts are very deteriorated