T448.  Namban tsuba.  7.5 x 7.9 x .45 cm.  The nakago hitsu-ana is .8 x 2.7 cm.  Used to be tsuba like this were classified as Namban (Suthern Barbarian) but current research suggests may of them originated outside of Japan in south asia.  I’ll leave it to the experts to say where this one was made; I can tell you it is well made and in great condition.  And with a very reasonable price: $150.