Well used and moderately soiled Spalding red and black stitched baseball which is consistent with National League style. "World Series 1917 Giants vs. White Sox" inscribed on the sweet spot in period black fountain pen. Opposite sweet spot has additional period notations that are partially lost to history but include reference to Giants' player Lew McCarty. The ball originated in the York, PA area which may of relevance to provenance as McCarty resided in nearby Reading, PA up until his passing. While precise history is unknown it is interesting and noteworthy that McCarty entered the sixth and final game of the 1917 World Series as a pinch hitter with two outs in the bottom of the ninth inning. Perhaps, could this very ball be the final out? At a minimum, it is almost certainly one used within the Chicago White Sox World Series championship in 1917 that was the first, and only, of Joe Jackson's career: VG