THE EARLY PERIOD. Cover, apparently mailed without any postage, canc. with "TRESOR ET POSTES*512*16-7-16" with Serbian censorship canc. "PREGLEDALA/VOJNA CENZURA (1)" in blue-violet, arr. "CHAILLY*26.VII.16". The word "PREGLEDALA" was ereased and replaced by manuscript "Exempte de la censura/envoi du ministre Arm.". The cover taxed with 2x10c. Swiss stamps, because of manuscript indication rate "20" and cancelled with "LAUSANNE*26.VII.16". The postage due has been charged at double the domestic letter rate, not based on the foreign letter of 25c.