This is one of my favorites, gotta love all the cracks. I attempted to attribute it a number of years ago. It was fun identifying all the cracks and then highlighting them in RED then taking another look at both sides marveling at the mess.
1P. There's a number of major telltales, the most prominent to me being the massive destruction around the date. 1J has an early and prominent crack from chin through neck and the 1 in the date as a counterpoint.