Those facts are found on the original snipe still attached to the photo.
The picture is amazingly clear for a 70 year old photo, and the corners are sharp.
The Subject: Willie Mays is the gold standard for post-war baseball photography. Many baseball fans consider the hall of famer to be the greatest centerfielder in the history of the game.
Type 1 Status: The INP stamp and the attached snipe dated June 5, 1955 (exactly when the event occurred) are the primary indicators that this is a true Type 1.
The Photographer: Dick McEvilly worked for INTERNATIONAL NEWS PHOTOS, whose stamp appears on the verso. He was active primarily in the 1940s and 1950s, frequently covering the New York baseball beat
Condition: No rips, tears, or creases and, has sharp corners. This condition is rare in the vintage photo market, where newsroom photos were handled roughly—marked with grease pencils or cropped for print.