Design features

Type D
Diameter 17 mm
Shape Round
Weight 3.103 grams
Edge

Milled

Obverse

 In the center field, the national shield with the inscription "ESTADOS UNIDOS MEXICANOS" (UNITED MEXICAN STATES) along the top of the coin.

Reverse

 In the middle part of the coin, the number fifty, "50," as the key motif and denoting face value; to its right the cent symbol "¢"; top center, the mint year; below the center, the Mexican mint mark "M°"; parallel to the edge, at the bottom, a stylized image of the "Ring of Acceptance of the Sun Stone."

Composition

 Stainless steel alloy comprised of the following materials:
  • Between 16% and 18% (sixteen and eighteen percent) chrome;
  • 0.75% (seventy-five basis points) nickel, maximum;
  • 0.12% (twelve basis points) carbon, maximum;
  • 1% (one percent) silicon, maximum;
  • 1% (one percent) manganese, maximum;
  • 0.03% (three basis points) sulfur, maximum;
  • 0.04% (four basis points) phosphorus, maximum; and
  • The remainder, iron.
In circulation as of August 6, 2009.

Background information