Wilt Chamberlain captured America’s imagination for two decades. With his 7-foot-1 frame, his commanding presence on the basketball court, his ability to rebound and score and his astounding athleticism, he became one of the most memorable players in N.B.A. history.

Now, Chamberlain, the only man to score 100 points in an N.B.A. game, will become the first player from the league to be honored with a postage stamp in his image. And fittingly enough, the two versions being issued by the Postal Service are nearly two inches long, or about a third longer than the usual stamp.

It would not be right any other way for the player known as Wilt the Stilt and alternately as the Big Dipper. Chamberlain died in 1999 at 63, but his name still resonates in the sport. And even at its atypical size, the new stamp could barely contain Chamberlain’s dimensions.

“We still had trouble fitting him into those proportions,” said Kadir Nelson, the artist who painted the images.