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Unlisted – Great Britain 1966 Technology 6d phosphor lines on the gummed side

An uncatalogued variant of the 1966 Technology 6d SG702p exists

This has the nomal 3 phosphor bands on the front, but in error, there are also 3 phosphor bands printed on the gummed side. This is unlisted in SG Specialised catalogue volume 3 (1998 edition).