States of Guernsey overprints, Cyril Patrick Mahon, 1, 18 September 1941, serial number C76 082251, green and blue-mauve, ornate crowned vignette of Britannia at left, value at right, purple overprint at centre Withdrawn from circulation September 18th 1941, reverse green, value at left and right (EPM B212A, Pick 363e), ex Spink 2015. Only 48 Mahon examples believed extant and only nine with prefix C. In PMG holder 25 Very Fine, rare