Mexico City mint, KM155, Onza-758. A well defined coin with only mild high-point wear, good surface quality and substantial underlying mint luster under the light incipient orange patination. One of the rarest dates of this elusive type, incredibly challenging in grades approaching Mint State level. Among the very finest of the date seen by us and equivalent to the Rudman example, which hammered for $15,000 (plus fees) in 2015.