1963 Beisbolistas of 15-year MLB pitcher Miguel ("Mike") Cuellar.

This example shows corner wear and surface scuffs, and mild staining on the reverse. 

Mike Cuellar was a four-time 20-game winner for the Baltimore Orioles, and won 185 major-league games in his career. He was also known as one of the most superstitious players in baseball.

The 1963 Beisbolistas set was issued in Mexico. Cards measure about 1 7/8" by 2 1/2". Less than 3 examples of any card are known. Some cards have zero examples that have surfaced, so at this time, a "complete" set of this rare issue isn't possible.