Nice find,
To the best of my knowledge it is a missing 'red' variety (tend to be found most commonly on Boston players). I understand that red was the last color process used for T206 printing, hence the card looks complete except for the red lettering.
It's a nice example and happens to be quite high grade an error of that type. Most of my missing reds are beaters.
If you become interested in selling/trading shoot me a line -
scottglevy@yahoo.com
Best Regards,
Scott