Fifty centavos coins
The 50 centavos coins were made in nine basic types:
Type 1 - .800
Type 2 - .800, reduced
Type 3 - .720
Type 4 - .420
Type 5 – Cuauhtémoc
Type 6 – Big Cuauhtémoc
Type 7 - Copper-nickel.
Type 8 – Stylised Eagle
Type 9 - Palenque
Type 1 - .800
KM-445 1908 50c
These coins, authorised by a decree of . Their composition was 80% silver and 20% copper. Weight was 12.5g. Mintage was
| Year | Mintage |
| 1905 | 2,446,000 |
| 1906 | 16,966,000 |
| 1907 | 33,761,239 |
| 1908 | 488,000 |
| 1912 | 3,736,000 |
| 1913 | 10,510,000 |
| 1914 | 7,710,000 |
| 1916 | 480,000 |
| 1917 | 37,112,000 |
| 1918 | 1,320,000 |
Type 2 - .800, reduced
KM-446
The second type was authorised by a decree of These were like Type 1 but 3 mm smaller in diameter. Their weight was 9.06 g. Mintage was 2,760,000 in 1918 and 29,670,000 in 1919.
A 8 over 7 overdate is known.
Type 3 - .720
KM-447 1939 50c
These were like Type 2 but had a reduced silver content of 72% silver and 28% copper. Weight was 8.33 g. Mintage was
| Year | Mintage |
| 1919 | 10,200,000 |
| 1920 | 27,166,000 |
| 1921 | 21,864,000 |
| 1925 | 3,280,000 |
| 1937 | 20,000,000 |
| 1938 | 100,000 |
| 1939 | 10,440,000 |
| 1942 | 800,000 |
| 1943 | 41,512,000 |
| 1944 | 55,806,000 |
| 1945 | 56,766,000 |
Type 4
KM-448 1935 50c
This coin, authorised by decree of and issued with a date of 1935, had an even further reduced silver content, of 42% silver and 58% copper. Weight was 7.973 g. Mintage was 70,800,000.
Type 5 – Cuauhtémoc
KM-449 1950 50c
These had a composition of 50% copper, 30% silver, 10% nickel and 10% zinc. Weight was 6.666 g. Mintage was 13,570,000 in 1950 and 3,650,000 in 1951.
Type 6 – Big Cuauhtémoc
KM-450 1959 50c
These were 7 mm larger in diameter than Type 5. These had a composition of 95% copper, 2.5% tin and 2.5% zinc. Weight was 14 g. Mintage was
| Year | Mintage |
| 1955 | 3,502,000 |
| 1956 | 34,643,000 |
| 1957 | 9,675,000 |
| 1959 | 4,540,000 |
Type 7 - Copper-nickel
KM-451 1969 50c
These were like Type 6, but composed of 75% copper and 25% nickel and 8 mm smaller in diameter. They weighed 6.5 g. Mintage was
| Year | Mintage |
| 1964 | 43,806,000 |
| 1965 | 14,326,000 |
| 1966 | 1,726,000 |
| 1967 | 55,244,000 |
| 1968 | 80,438,000 |
| 1969 | 87,640,000 |
Type 8 – Stylised eagle
KM-452 1970 50c
These were like Type 7, but with the obverse redesigned such that all the devices are depicted as raised outlines on a flat surface, rather than as fully contoured shapes. Mintage was
| Year | Mintage |
| 1970 | 76,236,000 |
| 1971 | 125,288,000 |
| 1972 | 16,000,000 |
| 1975 | 177,958,000 |
| 1976 | 37,480,000 |
| 1977 | 12,410,000 |
| 1978 | 85,400,000 |
| 1979 | 229,000,000 |
| 1980 | 89,978,000 |
| 1981 | 142,212,000 |
| 1982 | 45,474,000 |
| 1983 | 90,318,000 |
Type 9 – Palenque
KM-492 1983 50c
These were composed of stainless steel, and weighed 4.2 g. Mintage was 99,540,000 in 1983.
They are known with Thick Snake and Thin Snake.