unused  -- 6c. on 8c., variety surcharge inverted, mint; some ink offset on gum, otherwise fine and scarce. B.P.A. Certificate (1991). S.G. 40a, £650. Photo
unused -- 6c. on 8c., variety surcharge inverted, mint; some ink offset on gum, otherwise fine and scarce. B.P.A. Certificate (1991). S.G. 40a, £650. Photo

Details
unused -- 6c. on 8c., variety surcharge inverted, mint; some ink offset on gum, otherwise fine and scarce. B.P.A. Certificate (1991). S.G. 40a, £650. Photo