The following coins continue to be valid for transactions.
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Obverse  |
The upper rim includes the lettering “ESTADOS UNIDOS MEXICANOS” (UNITED MEXICAN STATES), with the national seal upraised in the center field. |
| Diameter | 32.0 mm |
| Shape | Round |
| Weight | 15.945 grams |
| Edge |
Interrupted milled  |
| Composition |
Bimetallic coin comprised of two alloys, one in the center of the coin and the other in its peripheral ring, as follows: 1. Center of the coin: Nickel and copper alloy.
2. Peripheral ring of the coin: Bronze-aluminum alloy.
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Reverse
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At the center of the field, and as the main motif, an equilateral triangle –an internationally accepted element- as a symbol of prevention/safeguard. Within the triangle, the legend “50 years” appears, and behind the triangle, two crossed anchors. Earth, wind and fire elements are represented over the triangle. These elements are the means through which the Mexican Navy executes its functions to aid civilians. The earth elements are represented by the binomial of a marine and a dog, key in searching and finding people. The air elements are represented by a helicopter, through which personnel and goods/materials are transported and which allows for rescuing victims in hard-to-reach areas. The sea elements are represented with a logistical support vessel, which is used to transport food supplies, equipment and human resources. The legend “PLAN MARINA” (Navy Plan) appears in the upper part of the coin, in a semicircle; the year “1966” appears on the left-hand side; and the year “2016” on the right-hand side. An below these, Mexico’s mintmark “M°”. Finally, the coin’s exergue shows the denomination, with the number “$20”. |
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Reverse
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As the coin´s main motive and in the field’s center, the figure of the DN-III-E Plan’s distinctive bracelet, with the lettering 50 AÑOS PLAN DN-III-E ("50 YEARS DN-III-E PLAN") and two images of the Mexican Army and Air Force, respectively. The years 1966 and 2016 engraved to the left and right of the bracelet, respectively. Surrounding the bracelet, in a semicircle, in the upper part of the coin, the lettering SECRETARÍA DE LA DEFENSA NACIONAL ("MINISTRY OF DEFENSE"), and in the lower part, the lettering EJÉRCITO Y FUERZA ÁREA MEXICANOS ("MEXICAN ARMY AND AIR FORCE"). This set of images is framed by a stylized string. The exergue of the coin includes the denomination in number ($20); in the right margin there is the Mexican mint mark "M°", and in the upper part, the denomination in letters VEINTE PESOS (“TWENTY PESOS”). |
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Reverse
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The reverse side of the coin includes, as a main motif, in the center of the field (from left to right), the image of Pastor Rouaix, congressman of the Constituent Assembly; Venustiano Carranza, head chief of the Constitutionalist Army; and, Francisco J. Múgica and Heriberto Jara, congressmen of the Constituent Assembly. In the background, there is an image of the original cover page of the 1917 Constitution of the United Mexican States and, to the right, the Mexican mint mark "M°". Surrounding this image composition, the date FEBRUARY 5 and the names PASTOR ROUAIX, VENUSTIANO CARRANZA, HERIBERTO JARA, and FRANCISCO J. MÚGICA. Surrounding this image, in the center of the field's upper side, the $20 denomination and, in a semicircle, in two lines, the years 1917-2017 and the lettering CENTENARIO DE LA CONSTITUCIÓN POLÍTICA DE LOS ESTADOS UNIDOS MEXICANOS (100th ANNIVERSARY OF MEXICO'S CONSTITUTION). |
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Reverse
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The key pattern included in the coin’s center field features the left profile of General José María Morelos y Pavón; in an upper semicircle, and in two lines, there is the legend "BICENTENARIO LUCTUOSO DEL GENERALÍSIMO JOSÉ MARÍA MORELOS Y PAVÓN" ("BICENTENNIAL OF JOSE MARÍA MORELOS Y PAVÓN’S DEATH"); in the left and right margins, respectively, there is the years "1815" and "2015"; in the exergue, in the lower semicircle, there is the denomination in letter "VEINTE PESOS"; and, to the right of the hero’s figure, there is the Mexican mint mark "M°". |
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Reverse
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The key pattern included in the coin’s center field features a graphic set representing Mexico Air Force’s centennial, which includes the numeral “100” right below the years “1915-2015”; an equilateral triangle engraved in 3 lines, which represent the national flag colors, with one of its vertex facing down, and the base, which is the symbol of Mexico’s Air Force, facing upwards; a wing, which symbolizes flight and in 1915 was used by the military air forcé weaponry; a five-pointed star, representing victory, which simulates the rising up to present times and which in 1915 was part of the coat of arms of the military air force; the lettering “FUERZA AEREA MEXICANA” (MEXICAN AIR FORCE) in an upper semicircle, and the motto “SALVAGUARDANDO EL ESPACIO AÉREO NACIONAL” (PROTECTING THE COUNTRY’S AIRSPACE) in a lower semicircle, on the right side; and, on the left margin, the word “AÑOS” (YEARS), which is a complementary feature of the numeral on the coin’s center field. |
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Reverse
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The back side of the coin has at the center of the field the relief figure of General Francisco Villa mounted on a horse, and of Generals Felipe Ángeles and Pánfilo Natera, main masterminds of the Taking of Zacatecas, aside. On the lower part of the field, there is the silhouette of the top of the mountain of La Bufa (cerro de La Bufa), a strategic vantage point for the ongoing battle to gain control of the city. In the upper exergue there is the legend “CENTENARIO DE LA TOMA DE ZACATECAS” (Centennial of the Taking of Zacatecas) and in the lower exergue, the years “1914-2014” (alluding to the 100th anniversary), the 20-peso denomination ($20), and the Mexican mint mark “M°”. |
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Reverse
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The back side of the coin has the relief figures of Virgilio Uribe and José Azueta, and underneath them, Mexico’s Naval Academy building. The figures of civilians defending the port of Veracruz appear on the left side of the coin and an anchor on the right side. In the upper exergue, there is the legend “CENTENARIO DE LA GESTA HEROICA DE VERACRUZ” (CENTENNIAL OF THE HEROIC DEED OF THE PORT OF VERACRUZ) and the names “José Azueta” and “Virgilio Uribe” underneath it. In the lower exergue, there is the inscription “Escuela Naval” (Naval Academy) and the years “1914-2014”. Finally, on the left side of the field there is the Mexican mint mark “M°”, and on the right side, the $20 denomination. |
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Reverse
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The inner part of the coin features a three quarter view portrait of Chiapas senator Belisario Domínguez. Behind the portrait there are two stripes laying across from left to right. Along the top of the portrait, in three lines, there is the motto BELISARIO DOMÍNGUEZ ENNOBLECIÓ A LA PATRIA (BELISARIO DOMINGUEZ DIGNIFIED OUR HOMELAND). On the right side of the portrait, there is the Mexican mint mark “M°” and the years 1863-2013. In the outer field, on the left side of the coin, there is the motto 100 ANIVERSARIO LUCTUOSO (100 ANNIVERSARY COMMEMORATING HIS DEATH) and on the right side, the motto 150 ANNIVERSARY COMMEMORATING HIS BIRTH. Finally, on the exergue, there is the $20-peso denomination, in number. On the front side of the coin, in the outer field, milled geometrical figures of squares with dots and triangles border the rim. |
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Reverse
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The inner part of the coin features the silhouette of a soldier with a helmet, flanked by the years 1913 and 2013, with the legends “100 años del Ejército Mexicano” (100 years of Mexico’s Armed Forces) in an upper semicircle, and “100 años de lealtad” (100 years of loyalty) in a lower semicircle. In the outer ring’s upper margin there is the denomination VEINTE PESOS (TWENTY PESOS) (in letters) and in the lower margin or exergue, the denomination $20 (in numbers). On the left side of the coin there is the mint year 2013 and on its right side, the Mexican mint mark “M°”. The coin’s outer ring bears elliptical friezes. |
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Reverse
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Away from the center, in the left-hand field, the bust of Octavio Paz. Away from the center, in the right-hand field, the inscription "1990 Premio Nobel de Literatura" (1990 Nobel Prize in Literature). In the upper field, next to the peso “$” sign, the number “20”, and below it, the name OCTAVIO PAZ. In the upper left-hand field, the number 2010; in the upper right-hand field, the Mexican mint mark “M°”. In the exergue, next to the edge, the words “VEINTE PESOS” (TWENTY PESOS); above these words, in a semi-circle, the inscription “Todo es presencia, todos los siglos son este presente” (Everything is presence, all centuries are the present one). Smooth edge. |
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Reverse
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On the left is a young portrait of Octavio Paz with a three quarter profile; on the right the inscription “Todo es presencia, todos los siglos son este presente” (Everything is presence, all centuries are the present one) (on three lines) taken from the author’s poem “Fuente” (Source) about the change of millennium (the years 2000 and 2001), when the coin was minted. The poet and essayist’s signature appears in the lower part. In the exergue, next to the edge, is the mint year; on the left is the Mexican mint mark “M°” and above it, in a semi-circle, the denomination $20 (twenty pesos). |
| 50th anniversary of the implementation of the Navy Plan (Plan Marina) | November 23, 2018 |
| Fiftieth anniversary of the implementation of the DN-III-E Plan | July 12, 2017 |
| 100th anniversary of the enactment of the Constitution of the United Mexican States (February 5, 1917) | February 5, 2017 |
| Bicentennial of General José María Morelos y Pavón’s death | December 22, 2015 |
| Centennial of Mexico’s Air Force | October 14, 2015 |
| Centennial of the taking of Zacatecas | September 5, 2014 |
| Centennial of the heroic deed of the port of Veracruz | August 14, 2014 |
| 150th anniversary of the birth and 100th anniversary of the death of Belisario Domínguez | November 5, 2013 |
| 100 years of Mexico’s Armed Forces | August 15, 2013 |
| Twentieth anniversary of Octavio Paz receiving the Nobel Prize in Literature | March 31, 2011 |
| Octavio Paz, the new millennium | April 3, 2000 |