I am keeping mine. I have 2 sets graded 70. Intend to pass to my 2 kids along with 4 2012-S sets graded 70. I did recently sell one 25th Ann.69 set. And will probably sell the other 2 mixed grade sets. One of those mixed grade sets has a "S" MS70. I hate to sell it, but I'am leary of breaking the sets up. How do you feel about breaking those up?