The iron prosthetic hand worn by Gottfried ‘Götz’ von Berlichingen - also known as ‘Götz of the Iron Hand’, ca. 1480 – 23 July 1562 who was a german imperial knight and mercenary.
sources: 1 | 2EDIT:
Oi, that about Götz von Berlichingen and Guts from Berserk may be just a coincidence.
I remember I’ve read somewhere that Miura has heard of Götz and his iron hand afterwards long since he’s created Guts.
but It’s just interesting something similar did exist and that dude was also a knight/mercenary.
July 25, 2012: It’s old-fashioned automail. ^_^