About DBR Grading
We assign both a 'DBR' grade and a third-party grade (TPG) whenever possible. The DBR grade is our qualitative assessment of a note's condition. DBR uses the classic descriptors, from Fair at the low end of the scale, to Gem at the high end.
At the same time, if the note has been graded by a TPG service, we show the name of that service and the grade, e.g. PMG 15. These TPGs sometimes use modifiers like EPQ, which means Exceptional Paper Quality, and PPQ, which means Premium Paper Quality.