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Todd Schultzunless you're truly wanting to sell the card or buy another. I'll take a stab here, although I don't know your card's dimensions, have not seen one before,and would want to view it under a loupe for dot patterns.
Looks like a fantasy or collector card to me, issued after the fact. The back uses purple ink that is often found in prewar period, which makes me suspicious of the creator's intent. The front uses a typeset that I have not seen before, and which I do not believe matches up with anything else from the period, although I'll let others disagree. It is also highly unusal for a period card to carry the date--other than magazine/newspaper supplements that were issued on a particular date, I do not recall seeing this before either (save for some copyright dates). The large caption area below the picture is also unique to me.
If authentic and period, it stands alone as a separate issue, not a variation. It would also predate Mendelsohn's m101 set by a few years, his being the first to use B&W "action" shots on a wide-scale basis (other than arguably T222). Seems odd that we would not have seeen one before, although that doesn't mean all that much. Why do you reference it as a Sporting News card, and do you have any other info to share about it?