T307.  Iron sukashi tsuba.  8.4 x 8.5 x .5 cm.  The nakago hitsu-ana is .9 x 3.1 cm.  This tsuba comes in a higher end box with pillow and a label: Owari Raimon Yotsuwari Hishi Sukashi (Owari thunder crest divided 4 ways).  This is a very impressive tsuba in excellent condition.  The surface is soft, velvety and the color is deep black.  $550.