These are made and sold as novilty items by private individuals, they are not made by the US mint. Depending on age and style, these can vary from around $5.00 for newer examples, to over $30.00 for older ones.
Repousse in metal work means hammered into relief from the back side of the metal.
1930 Indian Pop Out Cent
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1930 Lincoln Pop Out Cent
Photo By Heritage Auction Galleries
1930 Pop Out Cent
Photo By Heritage Auction Galleries