Shown on this pin is the relief of Josip Tito and the words: “1945 Salute To Tito 1955”. So this pin is probably from 1955. From 1945-1955 Tito was premier of Yugoslavia before being president until his death in 1980.
Also shown on the pin is the Stafeta. Stafeta was a relay race. The relay carried a baton with a birthday pledge to Josip Tito from all young people of Yugoslavia. The race usually started in Tito’s birth town Kumrovec and went through all major towns and cities of Yugoslavia. It ended in Belgrade at JNA Stadium (Yugoslavic People’s Army) on May 25th, Tito’s official birthday and Day Of youth, a national holiday.
So probably this pin was issued around the 25th of May 1955.