Revolutionary War era Artillery Worm

Revolutionary war era iron artiller worm in excellent condition.  Double row of 3 twists approx. 6.50 in. long by 3 in. wide with a tang for attaching to a pole.  Iron is well cleaned and appears hand forged.  This would have been the proper size for a 4 lb. cannon or larger.  This is a very rare piece and a must have for any artilllery collection.