The first coins struck in all of the Americas are Mexican. The history of Mexican numismatics begins in 1535 when Viceroy Don Antonio de Mendoza created the first mint in Mexico, and in all of America, by mandate of King Carlos I and Queen Juana.
While the United States divided their dollar into 100 cents early on from 1793, post-independence Mexico retained the peso of 8 reales until 1863. 
The restored Mexican republic under Benito Juarez and Porfirio Diaz continued the minting of centavo coins.
The Second Mexican Empire of 1863-1867 commenced the minting of coins denominated in pesos and centavos.
Between 1960 and 1971, new coinage was introduced consisting of brass and cupro-nickel composition, from 1982 50-pesos in cupro-nickel. 
On January 1, 1993, the Bank of Mexico introduced a new currency, the nuevo peso.
Benito Pablo Juárez García (1806 – 1872) was a Mexican liberal politician and lawyer who served as the 26th president of Mexico from 1858 until his death in office in 1872. As a Zapotec, he was the first indigenous president of Mexico and the first indigenous head of state in the postcolonial Americas.
OBVERSE : The national emblem of Mexico 
Lettering: ESTADOS UNIDOS MEXICANOS
REVERSE : Portrait of Benito Pablo Juárez García to the right, value and date at left, 5 points above in Brail 
Lettering: ⠑⠚ $50 Mo 1987 JUAREZ
EDGE : Reeded
Mint mark: "Mo" Mexico City, Mexico
Mintage in 1987 Mo 210 000 000
Country                              United Mexican States 
Type                                  Standard circulation coin
Years                                      1984-1988
Value                                    50 Pesos 
Currency                              Peso (1863-1992)
Composition                    Copper-nickel
Weight                                 8.66 g
Diameter                               23.5 mm
Thickness                            2.55 mm
Shape                                Round
Orientation                        Coin alignment ↑↓
Demonetized                        15 November 1995
References                          KM#495, Schön#85