This buckle appears to be a cross between Northwest Coast and Navajo.  The outer band of the buckle is chipped turquoise that is in the style of Navajo or Zuni.  The center piece looks like ivory with a sailing ship and the designs around the sailing ship look to be Southwestern.  It is a mystery.  It is not stamped, but appears to be silver.  It measures 4″ x 2″.  Just a unique and unusual belt buckle.