The cloth band looks like a Vietnam (or later) American helmet band, the flexible kind. Painted strip could be anything. Helmet looks like an original m-42 (Shell) and decal looks good to me. Liner appears to be norweign. If I had to guess I would say it is an old re-enactors helmet from the 70's with a stripe painted on it so the re-enactor could rapidly id it, and a modern elastic band added for camoflauge foliage.