1d. rose-red, Imprimatur, with Letters in all four Corners, plate 148, AA, imperforate upper left corner sheet marginal with inscription and plate number ‚148‘, large margins and very fresh, the unique corner marginal Imprimatur from plate 148 in private hands (AL is in the N.P.M., London, TA is in the Royal Collection, TL is still attached to the Imprimatur sheet).
