A baseball bat used by Mickey Mantle; Rookwood art pottery; works by artist Edward Henry Potthast.

ANTIQUES ROADSHOW visits the American Sign Museum in Cincinnati, Ohio, for a look at vintage electric signs. Other highlights include a baseball bat used by Mickey Mantle; art pottery from Cincinnati’s very own Rookwood Pottery; and works by locally born and world-renowned artist Edward Henry Potthast, valued at $41,000-$63,000.