T504.  Shakudo tsuba, tanto size.  3.5 x 4.8 x .4 cm.  The nakago hitsu-ana is .8 x 2.2 cm.  Some tanto tsuba, in my opinion, are too ornate; they detract from the rest of the koshirae.  Sometimes something plain and simple is called for; this tsuba fits the bill.  Condition is excellent.  $75.