unused  10c. purple on red overprinted "S.O.", mint. B.P.A. Certificate (2000). S.G. S3, £1000. Photo
unused 10c. purple on red overprinted "S.O.", mint. B.P.A. Certificate (2000). S.G. S3, £1000. Photo

Details
unused 10c. purple on red overprinted "S.O.", mint. B.P.A. Certificate (2000). S.G. S3, £1000. Photo