The coin in question is a 1978 Lincoln Cent, also known as a penny, minted in Philadelphia, indicated by the 'P' mint mark. This coin belongs to the Lincoln Cents series featuring the Memorial Reverse, which pays tribute to the Lincoln Memorial in Washington, D.C. Struck from a brass composition, the coin has a weight of 3.11 grams and a diameter of 19 millimeters. It carries the denomination of one cent (1¢ or 0.01 USD). The 1978 Lincoln Cent has a high mintage of 5,558,605,000, making it relatively common in circulation. While the coin's physical dimensions show a width and height of zero, this typically indicates that dimensions like thickness or elevation in a more nuanced measurement category aren't applicable or not specified for the coin. Overall, the 1978 Lincoln Cent is a piece of American numismatic history, marking a modern era with its design featuring the iconic silhouette of Abraham Lincoln on the obverse and the representation of the Memorial on the reverse. Its abundance in mintage ensures that it remains an accessible and recognizable piece for coin collectors and hobbyists alike.