RTZ

ID (15 May 1956-1972)
Visuals: On a grey background or a superimposed picture of Zagreb, a white tube shape is seen. In it are several dots connected by rods, forming the letters "rtz". Below it is "radio televizija zagreb" in a roundish font.

Variants:
 * Sometimes, there isn't any text, leaving just the logo on either the grey background or on another one with rings surrounding it.
 * The logo may be all black and placed smaller on a strange flower-like design background.
 * The logo may be positioned to the right, with smaller copies over it and text on the left, with the text stacked on the right.
 * When HRT 2 started broadcasting, both channels got the logo with copies getting smaller to the right. To the bottom right was the text "1/2. program".

Technique: Probably none, considering that there is no video evidence.

Audio: Unknown, probably an announcer.

Availability: Outside of some photos on the Logopedia page, no other evidence of this logo exists, especially considering that Yugoslavia was a Communist nation.