Wrong section of Net54, but to answer you question (sorta) when I collected Rickey Henderson cards seriously over a decade ago, these were identified as 1991 Anonymous Gold Border. Not much help I know, but I don’t think anyone has attributed these to any manufacturer. The 4 Henderson cards had the same style back as your Griffeys with “939!” Overprinted on back to signify his SB record.
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http://imageevent.com/derekgranger
HOF "Earliest" Collection (Ideal - Indiv): 244/342 (71.4%)
1914 T330-2 Piedmont Art Stamps......: 114/119 (95.8%)
1923 V100 Willard's Chocolate............: 177/180 (98.3%)
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