1871 MAIL LONDON TO HOLLAND/1½D PL.1 (SG51) PAIR (OA PA). Large envelope (219x90) London to The Hague Holland with good vertical pair 1½d pl. 1 (SG51) lettered OA/PA, centred slightly to right and PA one shorter perf tied fine LONDON S.W/21 duplexes JA 21 71. On front fine circular 'PD hand stamp in red and Dutch receiver 22 JAN 71, stamps paying the ½oz 3d rate. Filing fold well clear of stamps. (Ref 72491).