The 2013 W SP is a variety coin of the American Silver Eagle. It has no place in an MS set, especially adding it 4 years after being minted. There is a category for the American Silver Eagle varieties. One day I have a 100% complete set, and next day I don't. All those bogus eagles that we had to have ( and paid premium prices for), are not included in the mint state collection, but as varieties. The P and S Eagles belong there too. Ever notice there are no NGC 2017 FDOI S Silver Eagles? Another bogus coin that we have to have? Next year maybe we will get a CC mint mark?