I've seen Campy in a Brooklyn, Montreal and various other Negro League uniforms, but this is the first time I've seen him wearing the uniform of the American Association Saint Paul Saints.
Featured above is an 1948 St. Paul Pioneer Press photograph of Hall of Fame catcher Roy Campanella, and it is currently on auction at Mile High Card Company (Link Here). According to the listing it was printed in the St. Paul Pioneer Press that year when word got around that Campy had been promoted to Brooklyn.
As you may know, Campanella started the year on the Dodgers in 1948, but was soon sent to Saint Paul.