THE BLADE MAY BE COPPER OR BRASS AND THAT WOULD BE UNUSUAL. I SUSPECT THAT IT IS A STEEL BLADE AND THE PICTURE QUALITY MAKES IT LOOK DIFFERENT. SURELY THE SELLER WOULD HAVE NOTED A COPPER OR BRASS BLADE IN HIS DESCRIPTION. THIS DAGGER LOOKS TYPICAL TO ME AND I DON'T SEE ANYTHING UNUSUAL ABOUT IT EXCEPT THE ODD COLOR OF THE BLADE IN THE PICTURE.
