T398.  Iron tsuba with raised rim and ants.  7.2 x 7.4 (measured across the corners) x .5 cm at the rim (the plate is 2 cm.)  The nakago hitsu-ana is .9 x 2.2 cm.  This is quite the playful tsuba, great fun.  The ants appear to be of silver and there are ample tekkotsu on the rim.  $225.