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Signature series

Signature series: A graded comic signed in front of a grading company witness, with a label that says so.

How we measure it

We flag a sale as signature series when the listing says so; the signer's name is not kept.

What it is not

An unwitnessed signature is not signature series and is compared separately.

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.