Up for auction is a very rare circa 1915-25 two sided flier put out by the Big League Base Ball Machine Co of San Francisco to promote its new invention a Baseball Pitching Machine.This machine was designed by the man that came out with the first non skid tire in 1910 Mr Keaton.I have his archive relating to this and this item came in that group.There is some vertical paper loss from top to bottom on each side of flier that can be restored.95 percent of the text is readable as are the three printed photos of the machine.The flier measures 9 x 11.75 inches