I vote for the burnished S ASE for now. However, the US Mint is strongly considering minting one in 2012 as an individual offering so this may become a yearly issue. TC
I vote Reverse Proof since that's where all of my neat (however small) errors have been! My 6th one arrives today!
The "S" it always has a special magic to collectors. If the mint doesn't make an annual issue it will be a type with only 100k. were RP now has 350k
Something can not be the "most unique". Either a thing is unique or it is not. At any rate, which ever of the ASE 25th Set-only coins you are thinking of, there are 100,000 of them, so take your pick.
Well, until the US Mint produces a 20xx-P mintmarked coin that has a mintage of less than 100,000 then the 2011-S will be the key to the uncirculated "series". Bu, it would have to be less than 100,000 I wonder if they might consider a "Burnished Uncirculated Set" consisting of Mint marked coins from the 3 mints in a special case? I'd buy it!
As do I. Unless the bullion piece is found to have a unique marker, this is the mathematic answer. The RP was produced 5 years earlier, so until they make more S mint coins, as a type it is the rarest of the coins in the 5 coin ASE set put out in 2011. It is highly likely they will make more in 2012 though, so that answer may very well change.
I don't know if it's the "most unique" but I like the reverse proof the best. The S mint is special...but the difference in the coin is just the mint mark which doesn't really jump out at your eye. The reverse proof has a very unique appearance so I vote for it.
