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In page Wrigley Field:

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In 2001, a series of commemorative postage stamps on the subject of baseball parks was issued by the U.S. Postal Service. Most of them were engravings taken from old colorized postcards, including the illustration of Wrigley Field. In the case of Wrigley, the scoreboard was cut off to hide the original postcard's banner containing the park's name.[citation needed] The stamp and its sources also show the center field bleachers filled with spectators, a practice that was later discontinued due to the risk to batters, who might lose the flight of a pitch amidst the white shirts. This led to the development of darker backgrounds to the pitcher's mounds.