1840 1d Black Pl.1b. Superb used four margin example (PB) cancelled by a crisp red MC. (Image)

1840 1d Black Pl.1b. Used large four margin example (PF) cancelled by a maroon MC.  (Image)

1840 1d Black Pl.1b. Fine group of ten adhesives containing two single 1d blacks and four subsequent examples offered in matched pairs with 1d Red-browns (SG7). All four margin and cancelled by MC's. Attractive group. (Image)

1840 1d Black Pl.1b. Two separate covers each bearing 1d Black Pl.1b cancelled by red and black MC's respectively. A fine pair of covers. Cat £1500. (Image)