IFEF stands for International Federation of Esperanto-Railway workers or International Railroad Esperanto Federation (Internacia Fervojista Esperanto-Federacio)
The 27th IFEF Congress, Villach, Austria, postmark issued by Austria on May 13, 1975. Note the special cachet on both covers: Little older from the 11th congress of IFEF in Linz, issued on May 13, 1959:
"Servo per Amikeco" ("Service through friendship"), Esperanto police slogan on a stamp issued by Israel in 2012 to commemorate the 50th anniversary of the International Police Association:
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