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It piqued my curiosity but IIRC it did look like it was as old as the stone. Maybe the vendor, way back when, put it on there or it was an escher label before they printed one with the more familiar...

What interested me about that stone was the 44 soft label didn't have the usual border escher put around their end labels. I have seen a few with "Guaranteed Soft" on one end and Gelb-Gruhn or Yellow...