SG 177 10/- Ultramarine Blued Paper with Original BPA Cert from 1951 signed by the eminent philatelist Robson Lowe. Crisp Steel Foreign Office S.W. May 8th 1886 CDS Cancel. The scarce blued paper variety with delicate bluing, full perfs, reasonable centering and very fresh colour. A feint pressed out diagonal corner crease upper left and 2 red diagonal crayon strokes. Some of the perf tips with postmark ink but still a very scarce stamp and priced accordingly.