5c Blue, Imperforate (315). Top margin block of four with arrow and Ball Marker, top pair barely hinged, bottom pair Mint N.H., large margins other sides, deep rich color, Very Fine and choice, the blue Ball Marker, caused by ink settling into indentations from a Brinnell plate hardness measuring device, is only found on the top, right and left arrow blocks, some arrow blocks do not have the Ball Markers at all, with 2018 P.F. certificate, Scott Retail as hinged position block

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