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Boxer known as the 'Boston Strong Boy' (1858-1918) recognized as the last heavyweight champion of bare-knuckle boxing under the London Prize Ring Rules. Sought-after vintage ink signature, "Compliments of John L. Sullivan, Nov. 18th, 1907,” on an off-white 4.5 x 2.75 slip affixed to a slightly larger card. In fine condition. Encapsulated in a PSA/DNA authentication holder.
