I think you guys are misunderstanding his question. Copper pennies (pre 1982) are worth more as copper than as a penny. 145 copper pennies to make one pound. #1 copper is $2.10 at my local yard currently. So the copper is worth more than the pennies.
If anyone finds a good answer to the question of the legality I am interested because I might have to take my copper pennies to mexico to scrap them. Maybe even make one of those machines that sorts the copper pennies from the zinc pennies.
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