Have a chance to purchase a manure spreader that is believed to be an Oliver.  It has pneumatic spoked wheels on rear and possibly been converted from horsedrawn.  Has a small metal place on side that says &amp;quot;Lot No.75&amp;quot; and also has castings numbers on a lever. It looks similiar to a I 70.  It is a green wooden box and wheels appear to be red. Can anyone help figure out how to identify this spreader?