PSA slowly educated themselves and corrected things, that's why they weren't initially labeled solely as MB versions.
It's tantamount to how many issues/problems there were with their mislabeling of many 1962 Green Tints and non-Green Tints (e.g., PSA 8 1962 Topps #190 Wally Moon No Cap - Green Tint, which is a card that does not exist, among many others).
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