French abstract painter (1921-2012) considered one of the fathers of European lyrical abstraction. Original abstract ink sketch accomplished by Mathieu on a white 6 x 4 card, signed and inscribed in the lower right, "Mathieu, to Tim O'Flynn, 92," with a maroon felt swatch affixed at the bottom. Also includes an ALS signed "Mathieu," two pages, 8.25 x 11.75, personal letterhead, November 1992, in full: "If you would like further information on my work do not hesitate to let me know." In fine condition. Accompanied by the original mailing envelope, as well as full letters of authenticity from PSA/DNA for both the sketch and letter.
