Add to Favorite Sellers. Jacob deGrom New York Mets Autographed Black Leather Baseball – Fanatics Authentic Certified. Jacob deGrom New York Mets Autographed Black Leather Baseball. Due to quantity levels, we do at times list a stock image of the product. This is done to standardize and expedite the listing process and only applies for merchandise that is comparably identical. Major League Baseball Authentication, Fanatics Authentic.