used 77, BA showing "A" square blank, margins nearly all round, just clipped at lower-right, suspicion of closed scissor cut at top left and tiny thin; also an example from plate 77B showing the "A" inserted, good to very large margins three sides, just cut-into at top, a scarce pair of adhesives. S.G. Spec. BS29a, b, #5100. Accompanied by letter from L.N. & M. Williams. Ex Wane. Photo