US Scott #C3 never hinged 24c green Curtis Jenny 1918 Center line Block of 4 og f/vf, only 1 center line block per sheet, see scans, $700 catalog as never hinged centerline block, Catalog value ($520 as singles), seldom offered, good luck bidders, $4 for insured shipping on mail in the US or $2 reg mail out of usa, thanks