SAMUEL CLEMENS MARK TWAIN AUTOGRAPHED LETTER SIGNED: Superb one-page autographed letter signed, with the original mailing envelope. Addressed entirely in Clemens's hand. The letter, dated January 28 (1905) and written on black mourning paper, reads as follows: ''Dear Sir (Edward Cobb): Mr. Benjamin has informed me of your generosity in the matter of the quick-claim deed and I thank you most heartily for it. I am obliged to write instead of calling in person because I am still confined to my bed with the remains of a long illness. Very Truly Yours, S.L. Clemens.'' William Crawford Plumley Estate. Letter measures 6 7/8'' x 4 1/2''.