Stellar single-signed ball from Detroit Tigers Hall of Famer Hank Greenberg. Official American League (MacPhail) ball is bright and in Excellent condition with the Hebrew Hammer's signature across the sweet spot in 9/10 black fiber-tipped marker. Stampings are light but legible and there is scattered minor toning. Hank's astounding 183 RBIs in 1937 is the third highest single-season total of all time behind on only Hack Wilson and Lou Gehrig. Comes with PSA LOA and has been graded MINT 9 overall by PSA.