T455.  Thin plate Katchushi tsuba.  8 x 8.7 x .4 cm on the raised rim (the plate is 2 mm).  The nakago hitsu-ana is 1 x 2.6 cm.  Katchushi were armor makers.  It is thought that they made tsuba at the side and often those tsuba were a thin iron plate with a raised rim.  The sukashi are damnedifino:-)  I don’t know what they represent but I find the design quite pleasing.  The tsuchime finish on the plate works well with the sukashi and nicely raised rim.  $285.