I received this reply recently from Liechtenstein. I had written to Prince Hans-Adam of Liechtenstein in November for his birthday.
The envelope was the usual from the Liechtenstein Royals.
Inside is the usual card from the Liechtenstein Royals. I scanned the card against a black background, so you can see the textured edge. The card is signed by Hans-Adam.
Many thanks for your kind wishes
on the occasion of my birthday