Hello, I like your description better than what I found. I do see a variation in the shape of the different heads, the round body seems to have been made by an inspector/machinist. The one in Skip's photo seems to have been forged, the stampings are dead straight.The edges of the back of the heads, and the relieved edges of the sides of the socket would have been hard to get on a lathe. Food for thought. Regards, Lou