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. Fountain pen signature, "Yours Truly, John L. Sullivan, Feb. 17th, 1900,” on an off-white 3.75 x 2.5 sheet. In fine condition, with clipped corners impinging on, but not affecting, the handwriting.
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