goro's Metal Pendant is one of the symbolic items of goro's along with the Eagle and Feather (XL).
At the time of launch, it was called "Tataki (Hammered)" because the entire process was produced by hammering with a hammer. It was also a very popular pendant because Goro Takahashi would produce it himself.
Goro Takahashi damaged his right hand, his dominant arm, in a fire accident in 1987, and the story is famous among goro's fans that he strapped a hammer to his hand to create the Metal Pendant right after the accident.