Not a printer's mark--
To my surprise [I had already looked at the card under my pocket microscope before posting], when I scrutinized the card in sunlight by a window, I could see that this was not a printer's mark, but rather some sort of detritus left on the card.
Sorry for the false alarm. It sure did look like a printer's mark.
It had also been mislabeled [as Bender, no trees, SC 350/460] by Probstein, so I returned it.
I mention this in case you see it again on ebay and wonder about it.
Thanks to Leon, drcy, and Pat R for responding.
Last edited by dougscats; 08-19-2018 at 06:43 AM.
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