MEXICO - UN PESO - 1966 - SC-

Obverse

Country name (Estados Unidos Mexicanos) in a semicircle over the Mexican coat of arms: a Mexican golden eagle standing on a prickly pear cactus devouring a rattlesnake. At the base of the cactus there is a holm oak (encino) branch on one side and a laurel branch on the other. Denomination and year at the bottom.

Lettering: 
ESTADOS UNIDOS MEXICANOS
·UN PESO 1961·

Translation: 
United Mexican States
·One Peso 1961·

Reverse

Jose Morelos portrait facing right

NOTE: Mintmark Mo to left of head

Edge

Plain with lettering

Lettering: INDEPENDENCIA Y LIBERTAD

Translation: Independence and Liberty

Comments

Coin composition Silver (.100) and Brass (.900), so this would rather be called a brass coin, but still 1.6 gram of silver is worth more than 14.4 grams of brass.
The exact composition of those coins is .700 Copper, .100 Nickel, .100 Zinc and .100 Silver.