I do not see any doubling myself. You stated the coin's composition backwards... it has a zinc core (verified by your weight) with a copper platting, not a rare coin. In 1982 they minted two different size dates, a large date and a small date... yours is the more common large date coin. Keep it and build a collection of Lincoln cents around it, or collect 248 more just like it to buy a regular coffee at Starbucks. 





















