Hello,  I found this today.  Interesting?     I do not think the perfs have been cut but I do not know anything about stamps from Yugoslavia and the only other copies I have seen of this stamp have always had full perfs. Perhaps this was from a booklet?

Anyway, it was issued in a Postal Services issue in 1990. SG 2596 and shows an ATR aircraft. This plane and variants of the model are built by a French / Italian aircraft manufacturer in Toulouse France. ATR is short for Avions de Transport, or Regional Air Transport in English  Nice little addition to the aviation album.

Have a wonderful weekend   Michael         cddstamps.com