T520.  Iron tanto tsuba.   5 x 6.1 x .4 cm at the raised rim.  The nakago hitsu-ana is .9 x 2.7 cm (this may have been mounted to an armor piercer (yoroi doshi) tanto.  A small building under a tree and 2 boats are at the bottom of the front side; either the moon or sun peeks out above a mountain at the top.  This is highlighted in gold and silver.  There is gold arabesque on the rim; maybe half of the arabesque is missing.  Was $110, now $75.