Considered by many to be the "true" Willie Keeler rookie card, the highly desirable 1899-1900 M101-1 Sporting News supplement is rare and incredibly desirable.  Due to their large size (roughly 8 3/4" x 11") and lightweight stock, the cards are typically found with significant condition issues, including paper loss, tearing, tack holes, scrapbook remains and significant trimming.  The premiums were each issued on one single day, distributed with copies of the Sporting News.  Keeler's supplement was issued on July 29, 1899, depicting him as a right fielder with Brooklyn.  They are quite valuable, and condition sensitive, due to their large format and flimsy stock.  As a result, this example exhibits some mild soiling, as well as corner clips at the upper right and lower left.  Small edge tears are noticeable here and there, certainly consistent with the issue, as is some moderate edge wear.  An outstanding, seldom-seen rookie supplement of Hall of Famer Willie Keeler.