F100.  A fine iron sukashi tsuba I would call Akasaka but I’m no authority.  7.1 x 7.2 x .5 cm.  The nakago hitsu-ana is .8 x 2.6 cm.  Not sure what the design is; maybe an insect of some sort?  Whatever it is it is very well done; this is a fine tsuba.  The iron is dense and condition is excellent.  $700.