The M & M Boys captivated America with their twin chase of baseball's single-season home run record in 1961. This dual-signed official American League (Cronin) baseball is near white, clean and vintage. The overall condition is EX-MT with a faded label. Mantle is on the sweet spot in 7.5/10 ink while Maris is on a side panel in 6.5/10 ink. This is a very rare baseball that was signed while the two were banging out homers left and right and comes from the personal collection of former major leaguer, Roy Sievers. The lot includes an LOA from Sievers, as well as an LOA from JSA.