Hello, someone can help me in telling me if it is authentic or a fake?

I believe it is real. It is an enlisted mans cap.
It is made of tricot material. I am not sure what the stamp on the crown lining represents. Unfortunatly it is badly mothed and the value would be considerably less than one in good shape.

looks good to me from the pics you posted.

Thanks guys! How might this be worth?

Due to condition probably top out at $295, it is an enlisted mans (or NCO)Infantry dress parade cap.