censor regd cover of world war 1 era

WWI censor covers from N&S america,Europe,MALAYA etc Post Cards, FDC new issues, Thematic post cards w/cancellations,printed slogans,postal history items,like covers,PostCards. Revenues,telegrams, tele phone cards, King documents,Palm leaf documents, diplomaticmail,aerogrammes,stationary,coins,stamps,cheques,shapes in stamps other than paperstamps,notes.first filghts,night first flight, maritime mail,deadpost offices ,London regd transit cd marking, see here SWEDEN cover Linkoping origion,registration cover censored by sticking extra sheet censor label on back unusual