Dapper is one of many ballplayers who only appeared in the major leagues during World War II. He had an eight-game career (April 19-May 3, 1942) in the big leagues where he went 8-for-17 for a .471 batting average. He hit one double, one home run, scored two runs, and had nine runs batted in. His on base percentage was .526, and his slugging percentage was .706.
On defense, he had 20 putouts, 3 assists, and no errors, giving him a fielding percentage of 1.000. He also took part in one double play.
Dapper is the only player in Major League Baseball history to be traded for an announcer. He was traded from the Brooklyn Dodgers to the minor-league Atlanta Crackers in exchange for Ernie Harwell (so that the latter could substitute for ailing Dodger broadcaster Red Barber).