One of 2 cards this HOFer has. Both were issued in Puerto Rico. This one is from the 1950-51 Denia issue and is blank-backed with a color image of Day in his Santurce uniform on the front.
Less than 10 examples of this card have surfaced, most in similar condition to this one which was graded a 1 (SGC 10) due to wear on the card's reverse.
The checkered pattern and lines on his face are a result of the scan and are not on the actual card.