The UNC is uncirculated and the BUNC is brilliant Uncircualted. The BUNC should be brighter with more luster. But for that matter so should the UNC maybe a little less brilliance. For the American Eagle Bullion Coins I would pruchase the cheaper of the two. If you are collecting to hold for Numismatic value, maybe the BUNC... Your call. I am getting PCGS MS69 graded coins for my collection. the MS70's are too rich for my blood..
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