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These notes are generally refereed to as Japanese Invasion Money (JIM). The JIM pound was issued utilising the Australian pound as the basic monetary unit, and was developed to maintain economic stability within the occupied country. The Japanese government would usually print these notes prior to invasion, and with the Pound already printed for use in Australian mandated territories throughout British Oceania, the currency for the invasion of Australia was already in place. Anyway, thought you might find this interesting, and for all you collectors out there, check eBay!
Joe.