Details
used 6d. mauve, abnormal plate 10, ML, neatly cancelled by part London "S.E/15" duplex leaving both plate number circles clearly visible; central thin and a few shorter perfs. but not detracting from this extremely rare abnormal. B.P.A. Certificate (1978). S.G. Spec. J78, £12,000. Photo
Further details
Note: It is believed that only ten examples of this abnormal are known, two of which are in institutional collections