Wartime 1 Sen Aluminum Coin (Late Period) — Testimony from Times of War

In 1941, the world was in the chaos of World War II. At this time, Japan was pressing on with war to strengthen its influence in the Asia-Pacific region. December 8 marked the start of the Pacific War with the attack on Pearl Harbor, and transition to a wartime system progressed rapidly. Prime Minister Hideki Tojo believed in the necessity of mobilizing the nation's resources to pursue war, greatly impacting economic policy. The resource shortage during wartime was severe, especially metals like copper and nickel were prioritized for military goods. Thus, aluminum was chosen as the coin material. Aluminum was lightweight, easy to process, and convenient for transport — a reluctant yet necessary choice to secure the resources essential for war efforts. The 1 sen aluminum coin was born amid this backdrop and used in daily transactions. During wartime Japan, the Price Control Order was enforced, with government interventions to curb price spikes, achieving economic control. The small denomination of the 1 sen coin played an important role in daily minor payments, though its value gradually declined due to inflation. By 1942, this coin too was affected by economic turmoil. Thus, the wartime 1 sen aluminum coin was more than mere currency; it was a mirror reflecting Japan's political and economic situation at the time.

The minting of the wartime 1 sen aluminum coin was a significant challenge for Japanese engineers of the time. The minting was primarily carried out at the Osaka Mint Bureau, established in 1871 with a long history as the center of Japan's coin minting. During this period, the supply of aluminum was prioritized for military use, making it difficult to secure aluminum for coinage. Technicians had to make the most of limited resources. Regarding aluminum purity, subtle differences arose due to wartime supply conditions. Typically, aluminum purity is about 98%, yet during the wartime 1 sen coin's production, it is known that the purity varied over time. These differences affect the coin's value among collectors. The 1 sen aluminum coin also had the year stamped, another distinction point for collectors. The minting process involved preparing aluminum sheets and pressing them out with a press machine. Though the machine employed the latest technology of the time, parts supply was sometimes disrupted by the war's impacts. Nevertheless, through ingenuity, engineers successfully produced high-quality coins. Produced between 1941 and 1942, the 1 sen aluminum coin was small, lightweight, and suitable for everyday use. However, its lightness and size also made it prone to being lost. Thus, the production of the 1 sen aluminum coin is the result of overcoming many difficulties, a crystallization of engineers' efforts and ingenuity of the time.

The wartime 1 sen aluminum coin circulated across Japan between 1941 and 1942. It was used in various daily situations, deeply ingrained in the lives of ordinary people. Particularly in wartime Japan, the scarcity of goods became critical, with prices trending upward. The government enforced the Price Control Order to curb price rises, but it couldn't fully suppress the effects of inflation. The 1 sen aluminum coin served as the smallest denomination currency in day-to-day transactions and was particularly valued for small payments like shopping at local markets or purchasing daily necessities. However, amidst economic disarray, the coin's value gradually diminished. Amid the ongoing war, resource shortages greatly impacted civilians' lives. Food and daily necessities faced rationing, with long queues becoming common as people sought limited supplies. Amid these circumstances, the 1 sen aluminum coin played an essential role in supporting small-scale transactions, although its worth eroded due to inflation. By 1942, the number of goods purchasable with a single 1 sen coin was limited, and people increasingly needed larger denomination coins. Thus, the 1 sen aluminum coin symbolized the wartime economic conditions and was an important currency supporting the daily lives of the people. However, as the war dragged on, its role gradually changed.

In 1943, with worsening war conditions, Japan faced further resource shortages. This year, the government decided to change the 1 sen coin material from aluminum to tin. This shift to tin came as securing resources became increasingly difficult due to the war's impact. Tin offered a more stable supply compared to aluminum and was easier to process. Tin 1 sen coins were minted from 1943 to 1945, leading into the post-war turmoil. This transition was not merely a material change but symbolized a shift in Japan's economic policy. Post-war, Japan underwent currency reform aimed at economic recovery, building a new monetary system. During this process, the wartime-used 1 sen coins gradually disappeared as new currency was introduced. The wartime 1 sen aluminum coin remained in circulation among the populace for a while post-war, but as the economy stabilized, its role ended. This coin remains crucial historical evidence for discussing Japan's wartime economic situation and currency evolution. Today, wartime 1 sen aluminum coins are popular among collectors; those in good condition or with distinct year stamps fetch high prices. Thus, the wartime 1 sen aluminum coin holds historical significance beyond mere currency, key to understanding wartime Japan's economy and politics.