almost looks black... they came in gray and light gray..
Scott 566 - A169 it is not a plate block as it doesn't have a PB #, so it's a block of 4. .30c each Unless you have something no one has ever seen, I would say it is the 566,,
I just emailed you a link that will take you to images of 566 and 696 from the National Postal Museum collection. Both stamps were printed with ink categorized as gray; the 566 is perf 11 and 696 is perf 11 x 10.5.
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