https://www.ebay.com/sch/i.html?_fr..._nkw=spitting+horse+Delaware+quarter&_sacat=0 The Spitting Horse Delaware quarter error was caused by a die crack running from the mouth of the horse that Caesar Rodney is riding all the way down through the “C” in “Caesar”. This error is found on only 1999-P Delaware quarters, which were struck at the Philadelphia Mint.
They're found mostly in the dugout. By the way, congrats to the Nats! Washington's first World Series Championship since 1924. Chris