And the 3 letters are ... CLR - Compagnie Luxembourgeoise de Radiodiffusion of course.
Which became CL(i)T(oris) - Compagnie Luxembourgeoise de Télédiffusion soon after.
And finally RTL - Radio Television Luxembourg.

RTL left the grounds in 1991 and 1996.

The Villa Louvigny was (just like the other Villa) in its 350 years of history a much sought after Villa for the rich, the powerful and the creatives.

When did the Villa Louvigny host the Grand Prix Eurovision de la chanson Européenne?

Send the numbers to the Pink Chest Keepers, write them down as a backup in your book and turn to the next page.