on 3d. green, unused with part original gum; slight gum thin at top due to partial hinge removal otherwise fine. Rare. B.P.A. Certificate (1998). S.G. 25, £1500. Photo " /> unused 2d. in black on<I> "Six/Cents"</I> on 3d. green, unused with part original gum; slight gum thin at top due to partial hinge removal otherwise fine. Rare. B.P.A. Certificate (1998). S.G. 25, £1500. Photo | Christie's