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加利福尼亚州太平洋国际博览会半美元是美国铸币局1935至1936年铸造的50美分纪念币，旨在纪念这两年举办的加利福尼亚州太平洋国际博览会。硬币由罗伯特·艾特肯设计，正面刻有加利福尼亚州州徽上包括弥涅耳瓦在内的多种元素，背面则是博览会上的建筑。制作方案得到批准后，旧金山铸币局生产出25万枚半美元，但实际销售情况远不及预期，有超过18万枚无人问津。为此博览会委员会希望能把库存退回重铸1936年新版，来年借博览会的东风取得销售佳绩。但新版硬币销售依然冷清，最终又有15万枚退回铸币局熔毁。
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