De Leon is most "famous" I guess for combining with Bob Dean on a seven-inning no-hitter July 25, 1973
The cards are of course (front and back):
Minor League card collectors are a funny lot, I guess.
We'll pay 50 or $60.00 (or more) for an old card set that features absolute nobodies. Although, in a sense, you're not a nobody if you were featured in an early TCMA set, right?
and you can see he didn't pitch badly in '74 for Cedar Rapids, either
a) 1973 TCMA Cedar Rapids Astros # 13
b) 1974 TCMA Cedar Rapids Astros # 27
c) 1975 TCMA Dubuque Packers # 20