Rob, hope it works out but it would appear this is a con job. A PSA4 Mantle sold(a different seller) on Oct 15th @10k....he sold the same cert Mantle @4500 on Oct 17th.
http://www.ebay.com/itm/1952-Topps-M...item337d07c1ff
http://www.ebay.com/itm/Mickey-Mantl...item3a7add9357