on "POSTAGE & REVENUE" 8c. yellow-green, a horizontal pair [43-44], [44] showing variety inverted "c" in "cents", unused with part original gum; perfs slightly soiled at top and a few split between. R.P.S. Certificate (1969). S.G. 55/55b, £350+. Photo" /> unused --<I> "6/cents."</I> on "POSTAGE & REVENUE" 8c. yellow-green, a horizontal pair [43-44], [44] showing variety inverted<I> "c"</I> in<I> "cents"</I>, unused with part original gum; perfs slightly soiled at top and a few split between. R.P.S. Certificate (1969). S.G. 55/55b, £350+. Photo | Christie's