GREAT BRITAIN 1987 (MNH) PRINCIPIA MATHEMATICA CYLINDER BLOCKS
Principia Mathematica Anniversary cylinder blocks x 6 (4 items): 18p (1A.–1B.–1C.–1D.–1E.–2F.), 22p (1A.–1B.–1C.–1D.–1E.–2F.–1G.), 31p (1A–1B–1C–1D–1E–2F–3G), 34p (1A.–1B.–1C.–1D.–1E.–2F.). Fresh and fine. Mint never hinged. SG1351-1354; SC1172-1175
