Interflug billboard in Budapest
At Deák Ferenc tér station, line 3, heading south in the direction of Kőbánya-Kispest.
I'm still not sure why it's here or what it signifies. The accompanying text is not technically correct (during the years of the GDR, East Berlin would be referred to either simply as "Berlin", or "Berlin, Hauptstadt der DDR"). The logo is spot on though. I'm interested to hear theories!
29th January: There are more of these billboards now at Deák Ferenc tér. Still don't know what they are...