Gut's knife, hand forged by me). The handle concerns me a bit - I made it bigger, because the thin one from the manga makes no sense - you can't grab it
PMP Knives Berserker - Big but not insane - YouTube
Gut's throwing Knife Berserk by ReProps | Download free STL model | Printables.com
Berserker bowie knife – FranLaff.com
BladeGallery: Fine handmade custom knives, art knives, swords, daggers
Midgards-Messer Little Berserker Order Now – Midgards Messer Shop