No overtaking allowed (arrows) - Οld Greek road sign. It was similar to the equal signs from China, Czechoslovakia, Italy, Japan, Nepal, Romania and Thailand. It was officially withdrawn by 1974.
{{en: Greek Traffic Police, Edit: <a href="https://el.wikipedia.org/wiki/User:244wiki" class="extiw" title="el:User:244wiki">244wiki</a>}}, {{el:Ελληνική Τροχαία, Επεξεργασία: <a href="https://el.wikipedia.org/wiki/User:244wiki" class="extiw" title="el:User:244wiki">244wiki</a>}}
Attribution
{{en: 244wiki,  It was published in the Greek 1965 Esperos Agenta}}, {{el: 224wiki, Δημοσιεύθηκε στην Agenta "Έσπερος" του έτους 1965.}}