States of Guernsey overprints, Cyril Patrick Mahon, 1, 18 September 1941, serial number B46 754532, green and blue-mauve, ornate crowned vignette of Britannia at left, value at right, purple overprint at centre Withdrawn from circulation September 18th 1941, reverse green, value at left and right (EPM B212A, Pick 363e), ex Spink 2005. Only 48 Mahon examples believed extant and only eight with prefix B. In PMG holder 30 Very Fine and rare