The Collaborative International Dictionary of English v.0.48:

Itzibu \It"zi*bu\ ([i^]t"s[i^]*b[=oo]), n. [Jap. ichibu.]
   (Numis.)
   A silver coin of Japan, worth about thirty-four cents.
   [Written also itzebu, ichebu, itcheboo, etc.]
   [1913 Webster]