Special Made for JNS. file finished 350 g Masayuki Genno with different water quenching
Hard carbon steel faces 55HRC. With different quenching under running water, so middle of the hammer remains soft wile the tops is hardened !
Master Masayuki is now Nr1 Hammer Blacksmith in Japan
He have learned 3 years at very famous hammer master Hasegawa Kouzaburou !