Grading question

I have some coins that are not TPG, but are labeled AU and BU.
What Sheldon numbers would those grades correspond to? Thanks.

 

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AU can range from 50-58 while BU can range from 60-70.

 

"BU" coins generally fall in the MS-60 to MS-62 range.

 

AU is 50-58.

BU is generally MS60 to MS63. (Hobo, I believe 63 is included in BU)

FWIW, "choice BU" is 64 and "gem BU" is 65.

 

Yeah, I should have also inculded 63.

 

The relationship between the descriptive grades and the Sheldon grades is fuzzy at best.
After a quick Google search the majority of sites say BU = MS-60 thru MS-62.
BUT
Some say MS-60 thru MS-63.
Others say MS-61 thru MS-63 (which probably leaves MS-60 as just UNC).