Those four aces who paced the 1971 Baltimore Orioles with at least twenty victories apiece have signed the offered pitching rubber. The 23-1/2 x 6" field adornment is penned by the hurlers near each corner in black Sharpie. Included are: Cueller (20-9), Dobson (20-8), McNally (21-5) and Palmer (20-9). With deference to slight ink migration (particularly to Cuellar's script) the signatures present ("8-9") in both strength and clarity. Full photo LOA from JSA.