This Viking / Norman helmet was handmade from steel, based on an original of around 900 AD.
Material thickness: 2 mm / 0.078"
Width: 18.5 cm / 7.28" (ear to ear)
Inner length: 22 cm / 8.66" (front to back)
Hatsize / inner circumference: 59/60 cm
Weight: 1.8 kg / 4 lbs