I recently bought this card from a Niekro collector who had done some independent research on the card and received some feedback (see link below):
http://forums.collectors.com/message...hreadid=828292
As you can see, Niekro is wearing an Estrellas de Oriente uniform from the Dominican Winter Leagues.
It has been confirmed that Niekro played for the Estrellas from 1966-67. He also played for a Dominican team from 1963-64. I am hopeful that the team he played for during the winter of '63-'64 was also the Estrellas de Oriente, as it would open up the possibility that this card dates from that season and would make it the earliest known Niekro card.
Any help would be much appreciated!!
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http://imageevent.com/derekgranger
HOF "Earliest" Collection (Ideal - Indiv): 250/346 (72.3%)
1914 T330-2 Piedmont Art Stamps......: 116/119 (97.5%)
1923 V100 Willard's Chocolate............: 180/180 (100%)