Uncommon vintage ink signature, “Sincerely, Knute K. Rockne,” on an off-white 3.5 x 2.25 slip, affixed to an 8 x 4 off-white page. In fine condition, with a couple mild bends and a hint of subtle toning. One of football’s most desirable signatures. Auction LOA Steve Grad/PSA/DNA and R&R COA.
