If you send it in the slab I doubt very much that PCGS would upgrade it. If however you crack it out it seems likely to me you would get that AU-58. A risk obviously, and I'm not sure PCGS AU-58 would bring a much higher price than old ANACS 55 if you decide to sell someday. There is however a $200 price difference between the two grades on the PCGS price guide.
Decisions, decisions......
Decisions, decisions......



















