From Kat O'Brien:

If Mussina does retire and makes it to the Hall of Fame, he said he'd be leaning towards going in with a Yankees cap and not an Orioles cap.

Of course, as we've come to understand, he doesn't have a choice. But, certainly a compelling case can be made for the Yankees. He pitched the first 10 seasons of his career with Baltimore and the last 8 with the Yankees. With the Orioles, he pitched in 288 games, going 147-81. Meanwhile, in New York, he's pitched in 248 games and is 122-72. The case probably becomes more compelling if his one and only 20 game season came in the Bronx, though.