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. Desirable fountain pen signature, "With compliments of John L. Sullivan," on an off-white 5.25 x 2.5 slip of Dante's Inferno Exhibition Company stationery, dated January 25, 1900 and affixed to a 5.75 x 2.25 red card. In very good to fine condition, with overall light creasing, rippling, and toning to the left side.
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