The Advanced Iron Prosthetic Hand used by Götz von Berlichingen, a Medieval German Knight & Mercenary, 16th century AD

Groovy

Built by the finest automail mechanic in Rush Valley, no less!

"Er kann mich..."

It's not stated in the Wikipedia article but I would be mildly surprised if he didn't influence Guts from Berserk wiki link

He lost an arm and had a similar prosthetic

His most famous saying was "Tell him he can lick my ass!" (German version of "suck my dick")

I always wonder if this mightve been some of the inspiration for that guy in Young Frankenstein, the burgher or sheriff or whatever.