Bold signature in black fountain pen ("S.L. Clemens") of the legendary American humorist given as the name of the sender on a roughly 4x5-inch tan envelope, entirely filled out in his hand and mailed in his later years from France. Nice for matting. The envelope itself shows some toning; a large square-shaped stain to the lower left-hand quadrant; postal cancellation marks; and a fold across the middle, not affecting the autograph.

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