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GREAT BRITAIN - OXFORD UNION SOCIETY SECURITY UNDER-PRINTS. 1864-1881 USED COLLECTION presented on a protective page that includes an impressive, hand picked selection of unofficial 'O.U.S.' under-printed issues. We see a choice selection of identified, 1d rose-red (SG 43/44) plates with Vertical under-prints, reading upwards inc Plates 169 x2, 179, 197, 204, 205 & 212 - Spec PP226, Plates 170 & 204 bearing variety 'MISSING STOPS AFTER O' - Spec PP226a, plus under-print reading down - Plate 156 - Spec PP227, 1d Venetian Red (SG 166) X3, one under-print reading downwards with Phot Cert (Spec PP 234), two reading upwards (Spec PP229) - one tied to a small piece by an Oxford '603' Duplex cancellation, 1881 1d lilac (16 dots - SG 172) under-print reading upwards (Spec PP231) . A magnificent, seldom seen & highly sought after range. (14 stamps)