PSA 6 EX-MT Gray Back. The item "1956 Topps #135 MICKEY MANTLE PSA 6 EX-MT Gray Back Great Centering" is in sale since Friday, September 20, 2019. This item is in the category "Sports Mem, Cards & Fan Shop\Sports Trading Cards\Baseball Cards". The seller is "ldholzmacher" and is located in Forestdale, Massachusetts. This item can be shipped to United States, Australia, New Zealand.