Japanese Invasion Money (JIM) refers to a series of military-issued fiat currencies circulated by Imperial Japan during World War II in the territories it occupied across Southeast Asia. These currencies were part of Japan’s larger ambition to establish the Greater East Asia Co‑Prosperity Sphere (GEACPS)—a regional bloc that, in theory, would be economically unified, with a centralized monetary system tied to Japan’s leadership.

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While often overlooked or undervalued today, JIM notes hold deep historical importance for each nation that experienced Japanese occupation. To fully understand these notes as collectors or historians, we need to look beyond the paper and explore the policy that created them.

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In addition, the Japanese military commissioned commemorative medals to mark their successful campaigns in the Philippines, which were struck locally by Philippine businesses under occupation. Today, these medals hold significant value in numismatics, prized for their rarity, craftsmanship, and as tangible reminders of the historical events during the wartime occupation.