unused 1c Green X die, 'Sample' handstamp in purple (RN-X5b var.), imprinted on front of intact unused two-portion Railroad Pullman ticket (porter's and passenger's checks), former check on white, latter on green, fresh, folded between halves, partly filled out, handstamped 'Sample' and with ms. 'Void', very fine, rare and very unusual, Scott retail $500.00, unlisted in Castenholz (similar on RN-X4a priced at $700.00) photo est.