I don't see any wear, so I agree with MS for details. Contact marks are few and small. The images don't give any indication of luster quality which is critical for assigning an MS grade number. If luster is unimpaired by cleaning I think an MS-63 grade is possible. If luster has been stripped (as the scan makes it appear) then you're looking at an "MS Details Cleaned" grade from ANACS or NGC or a "Genuine" label with a "cleaned" code number from PCGS.
Too bad, it has an excellent strike and great detail. Most collectors would be happy to own it.