'Pebbly' Jack was considered the best shortstop in history until the arrival of Honus Wagner, and he certainly looks impressive on the face of this rare and particularly strong specimen of the coveted N300 Mayo's series. Slightly frayed corners and very light edge wear put this card near the top of the very few even available to certify. As such, it has only been surpassed by two other examples certified by SGC (at the time of this writing).