States of Guernsey overprints, Cyril Patrick Mahon, 1, 18 September 1941, serial number prefix A76, green and blue-mauve, ornate crowned vignette of Britannia at left, value at right, purple overprint at centre Withdrawn from circulation September 18th 1941, reverse green, value at left and right (EPM B212A, Pick 363e), only 48 Mahon examples believed extant and only four with prefix A. In PMG holder 30 Very Fine, very rare