K60.  Fuchi kashira in either shakudo or shibuichi (not sure).  This was sold to me as a true set.  I don’t know enough about Japanese folk lore to provide the story that unites the 2 pieces but I can tell you that the color and work are the same.  Inside dimensions of the fuchi are 1.8 x 3.4 cm; the nakago hitsu-ana is .8 x 2.8 cm.  Insides of the kashira are 1.45 x 3.3 cm.  Other than for a bent himi-toshi on the side of the kashira condition is excellent.  $150.