Watch List notes:

MEXICO, United States of Mexico. 1905-pres. AV 20 Pesos (27mm, 16.69 g, 6h). Mexico City mint. Dated 1918. Eagle standing left on cactus in lake, wings spread, grasping snake in beak and right talon; all atop laurel and oak wreath / Aztec Sun Stone. BW 655; KM 478; Friedberg 171. EF.

From the Richard Basler Collection.