Nice find. The batwing was attached to the end of he leather sling belt and even with 4 rivets were notorious for getting caught on things and pulling the rivets thru the leather. Here a couple I dug in Gen Wilson Cav Corp camps here in Alabama and you can see the problems with the rivets. You normally find more batwings then the buckles or swivels. When you find all 3 you know you have found a complete sling that was lost or thrown away.
I meant to tell you that if your heart stopped with a batwing you better start taking a defibrillator so the day you dig your first CS plate they wont find you in the woods, dead with a smile on your face clutching a CS plate in your hands.