This question bugged me for about a day until it struck me that the guy's name was kind of unusual, began with "O" and was (probably) in the early (unnumbered) card series of the 1972 TCMA
"The 1930s".
Manuel Dominguez "Curly" Onis (1908-1995) went 1-for-1 in a single game for the Brooklyn Dodgers in 1935. (See
http://www.baseball-reference.com/pl...onisra01.shtml )
TCMA honored him among the first 72 (unnumbered) cards of the increasingly popular (and difficult to complete)
"The 1930s" series - a collection of more than 504 different cards and TCMA's largest. Cataloguers have assigned #56 to Onis' card - placing the those first 72 in alphabetical order for numbering purposes.