All coins minted from 1982 to now are made of 97.5% zinc and 2.5% copper. The 1951 wheat pennies were made with a plain edge and a diameter of 19.05 mm. The weight, however, varies. For example ...

“Today, the proof half-dollars, especially the 1950 and 1951 dated coins, are typically worth hundreds to thousands of dollars depending on how well they were preserved,” said Fuljenz.