The habaki is one of the most unique I have seen. It is constructed of copper with an obscure family mon of the Genjiko-no-zu which was most likely the family who owned this blade originally. It is deeply carved and the other side has varied rows of horizontal lines of different thicknesses. There are gold washed seppa as well as shitadome.

source: https://nihontoantiques.com/project/yokoyama-sukesada-sword-fss-760/