Tremendous 1928 Exhibit card of Gabby Hartnett, signed in bold, blue fountain pen, carefully across the breast.  A difficult signature due to Hartnett's passing in 1972, the writing runs nearly the entire width of the card, applied carefully and legibly, with some very light smudging to the ink visible in the last few letters.  The card itself presents well, likely in the VG range with some corner wear and a minor crease at the very lower-right corner.  Authenticated and encapsulated by SGC Authentic.