Q567.  Iron tsuba with brass inlay.  6.7 x 7.2 x .4 cm at the slightly raised rim.  The nakago hitsu-ana is .9 x 2.7 cm.  This is a design popular with the smiths of Higo.  Most likely a later work so it could go with any of the groups; Jingo might be a good fit.  That is quite the hat!  Condition is excellent.  Now $350.