Light Brown, imperforate, 1888 Post Office Official Seal (OX6), huge margins all around incl. part T. sheet margin, indistinct New York (18)90 duplex pmk., creased (but appears to have occured naturally during usage, the result of having been folded over the edge of a cover), otherwise very fine, extremely rare used, Scott states that it 'was not regularly used', with 1990 P.F. certificate, used examples are listed, but unpriced in Scott photo