coin is a coin that has never been circulated, and retains all of its original mint luster. BU stands for Brilliant Uncirculated
. This term is used less frequently now that the Sheldon scale
of numerical grading has come into vogue. A BU coin is usually described as MS (Mint State) today, and generally falls into the lowest MS grades (MS-60 through MS-62.) Higher MS grades are designated as "Choice BU" (MS-63 and MS-64) and "Gem BU" (MS-65 plus).
Also Known As: Mint State (MS)
Alternate Spellings: B.U.
The old 2x2 coin holder
said that my 1898 Morgan Dollar was BU
, and sure enough, it came back from PCGS graded MS-60.