I received this reply this week from Monaco. I had written to Prince Albert & Princess Charlene to wish their twins a Happy Birthday. I received 2 identical replies a few days apart.
The replies were a flat card with French on the one side and English on the other. The card features the twins monograms "J" for Jacques and "G" for Gabriella. In the center is the Monaco Coat of Arms. You can't tell from the photo, but the monograms and coat of arms are embossed in gold.
The card says:
T.T.S.S.H.H. (Their Serene Highness) Prince Albert II and Princess Charlene thank you warmly for the kindness you have shown towards Crown Prince Jacques and Princess Gabriella on the occasion of Their ninth birthday.
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