SGC recently had explained their Auth grade designations but I cannot find it now. PSA explains the Min Size designation as:
N6 Minimum Size Requirement - When a card is significantly undersized according to factory specifications. You will not be charged the grading fee in this instance. Note that this designation can qualify for encapsulation as "Authentic" only at the grader's discretion and if "Auth" is listed on the submission form as the desired minimum grade. You will be charged the applicable grading fee in the latter case.
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