In the old days workers for P.T.T. started young and had a life long career at the post office. Newcomers got a good training and in 1955 a book was published (95 pages!) ‘Wegwijzer voor jeugdig ptt personeel’ (Guide for youthful PTT staff).
Occasionally stamps are issued with design errors. Sometimes they are discovered before issuance and occasionally it leads to an issue being reprinted or not being issued at all. Most of the time however an emission simply appears, including the error or errors.
Belgium, together with Luxembourg, sent a UN-contingent to Korea in 1951. This contingent, the Belgian United Nations Command (BUNC), consisted exclusively of volunteer soldiers: 3.171 Belgians and 78 Luxembourgers.
Sending a telegram used to be the best way to get a message across quickly. In the age of the (steam) ship it could take weeks or months before normal mail arrived. Airmail was faster of course, but even that could still take quite some …