Mexico, 1964 AD., Mexico City mint, 25 Centavos, KM 444.

Mexico, Mexico city mint, 1964 AD.,
25 Centavos (ø 23 mm / 5,38 g), copper-nickel, 5,50 g. theor. mint weight, mintage 20.686.000 , axis coin alignment ↑↓ (180°), reeded edge,
Obv.: ESTADOS UNIDOS MEXICANOS , national arms: eagle with snake in beak on cactus left, oak and laurel branches below.
Rev.: VEINTICINCO CENTAVOS 1964 / Mo , bust of Francisco Madero facing slightly r., value and date in legend around, mint mark in r. field.
KM 444 .

Year / Mint Mark / Mintage
1964 Mo 20.686.000
1966 Mo 180,000 closed beak var.
1966 Mo ? open beak var.

Francisco Ignacio Madero González (30 October 1873–22 February 1913) was a Mexican revolutionary, writer and statesman who served as the 33rd president of Mexico from 1911 until his assassination in 1913. He was an advocate for social justice and democracy. Madero was notable for challenging Mexican President Porfirio Díaz for the presidency in 1910 and being instrumental in sparking the Mexican Revolution. In February 1913, a military coup took place in the Mexican capital led by General Victoriano Huerta, the military commander of the city, and supported by the United States ambassador. Madero was arrested and a short time later assassinated along with his Vice-President, José María Pino Suárez on 22 February 1913, following the series of events known as the Ten Tragic Days (la Decena Trágica). The death of Madero and Pino Suárez led to a national and international outcry which eventually paved the way for the fall of the Huerta Dictatorship, the triumph of the Mexican Revolution and the establishment of the 1917 Constitution of Mexico under maderista President Venustiano Carranza.

More on https://en.wikipedia.org/wiki/Francisco_I._Madero