28 mm diameter, 7.77 grams (120 grains), plain edge

Year Mintage Composition
1927 5,000,000* (most common date) Bronze alloy (95.5% copper, 3% tin, and 1.5% zinc)
1941 1,600,000
1942 2,400,000 Wartime bronze alloy (95.5% copper, 3% tin, and 1.5% zinc)
1945 960,000 (key date of series)
1946 960,000 (key date of series) Bronze alloy (95.5% copper, 3% tin, and 1.5% zinc)
1947 484,000**
* Proof issues reportedly struck. Mintage unknown
** Entire mintage melted down. Some specimens are known