What penny is illegal to own?

Could you elaborate on the context surrounding the penny that is allegedly illegal to own? Are you referring to a specific country's currency or a particular type of collectible penny that may have legal restrictions? It's important to clarify, as most national currencies, including pennies, are legal tender and can be owned and exchanged freely within their respective jurisdictions. However, there may be exceptions for counterfeit or rare coins with special legal protections or restrictions. Could you provide more details on the penny in question?