Mexico, 1979 AD., Mexico City mint, 20 Centavos, KM 442.

Mexico, Mexico City mint, 1979 AD.,
20 Centavos (20 mm / 2,97 g), copper-nickel, 3,06 g theor. mint weight, mintage 524.615.000 , coin alignment ↑↓ (180°), reeded edge,
Obv.: ESTADOS UNIDOS MEXICANOS , Mexico's national symbol, an eagle with a snake in beak, perched on cactus, facing left, enclosed in a circle formed by the legend and a wreath - El Escudo Nacional con el águila de perfil hacia la izquierda y devorando a la serpiente con el pico; está parada sobre un nopal y abajo las ramas de laurel y encino atadas por un listón. La leyenda "Estados Unidos Mexicanos".
Rev.: Mo / 1979 - 20 c. , bust of Francisco Indalecio Madero facing 1/2 right, flanked by value and date.
KM 442 .

Year Mintage
1974 112,000,000
1975 611,000,000
1976 394,000,000
1977 394,350,000
1978 527,950,000
1979 (incl. below) doubled die obv. large letters
1979 (incl. below) doubled die obv. small letters
1979 524,615,000
1980 326,500,000
1981 106,205,000 open "8"
1981 248,500,000 closed "8", high date
1981 (incl. above) closed "8", low date
1981 (incl. above) overdate variety "1982"
1982 286,855,000
1983 100,930,000 round top "3"
1983 (incl. above) flat top "3"
1983 998 Proof

Francisco Ignacio Madero González (30 October 1873 –22 February 1913) was a politician, writer and revolutionary who served as President of Mexico from 1911 to 1913. As a respectable upper-class politician, he supplied a center around which opposition to the dictatorship of Porfirio Díaz could coalesce. However, once Díaz was deposed, Madero proved to be ineffective, and the Mexican Revolution quickly spun out of his control. He was deposed and executed by the Porfirista military and his aides, which he had neglected to replace with revolutionary supporters. His assassination was followed by the most violent period of the revolution in Mexico (1913–1917), lasting until the Constitution of 1917 and revolutionary president Venustiano Carranza achieved some degree of stability. Followers of Madero were known as Maderistas.