That doesn't look like a hand-schuab helmet. It looks too 'clean'. Because HS's helmets were cast in aluminum, there is some minor pitting in them that needs to be sanded down, and they don't look quite as crisp and sharp as the helmet you have posted. As others have stated, you helmet looks to be cold-cast.
HS's helmets are metal all the way through, and weigh about 5-6 lbs. Much heavier than an FG or resin bucket.