This hammer head has a very deliberated section for nail removal, allowing a thin area to go under the head and then slipped further upward to completely remove a nail.  The head is square with some sprawling on the edges.  Weight is 11.8 ounces.  The handle section if oval narrowing as it gets to the top of the head.  I can make out a "02" which is the last numbers at the base of the horseshoe.  I believe this a farriers driving hammer by Diamond Horseshoe.