T319.  Sukashi tsuba, Akasaka.  8 x 8.2 x .5 cm.  The nakago hitsu-ana is .8 x 2.7 cm.  This is a classic Akasaka design and the tapered seppa-dai is a tell for early work.  I’m no authority but I do believe this to be early work.  Great surface, excellent condition.  This comes with a box.  $800.