MEXICO, Estados Unidos Mexicanos. 1917-present. 1/4 Onza 1999 Mo (Silver, 27 mm, 7.78 g, 6 h), Libertad. Ciudad de México (Mexico City). 1/4 / ONZA - PLATA / PURA / 1999 MEXICO Ley .999 Winged Victory holding laurel wreath in her right hand and broken chain in her left, Valley of Mexico in the background and Popocatépetl and Iztaccíhuatl volcanoes in the distance. Rev. ESTADOS UNIDOS MEXICANOS Coat of arms. KM 611. Very rare key date. Mintage of only 600 pieces. In NGC encapsulation, graded PF 68 Ultra Cameo. Proof. This lot can be shipped to a US address.