On Wednesday I got two postcards: one from Luxembourg and one from Spain.
The card from Luxembourg shows Grund. Grund is a quarter of Luxembourg City.
With a great stamp:
Grand Duke Henri (from set of four) (issued 16-03-2004)
150 years Treaty of London (issued 09-05-2017)
Silver foil was added to the stamp.
with a special Christmas postmark
Thank You very much William!