States of Guernsey overprints, Cyril Patrick Mahon, 1, 18 September 1941, serial number D89 673089, green and blue-mauve, ornate crowned vignette of Britannia at left, value at right, purple overprint at centre Withdrawn from circulation September 18th 1941, reverse green, value at left and right (EPM B212A, Pick 363e), only 48 Mahon examples believed extant and only twelve with prefix D. In PMG holder 45 Choice Extremely Fine, very rare