Grade population
Grade population: How many items a grading company has certified at each grade.
How we measure it
We record the published population count for each item, grade and grading company, with the date.
What it is not
A low population means few graded copies, not necessarily few copies in existence.
Where it appears in the data
Field names as the API returns them; each dataset's page in the API lists the field's type and unit.
population_countin datasetccg_population