The Liechtenstein Royals use the same envelope most of the time.
Usual
The Lichtenstein's usual envelope has a blank front. The palace uses real stamps and usually they are recently released stamps. But sometimes to you will see older stamps if they need a small domination.
The postmark is stamped on at the local post office and unlike the british monarchy isn't special for the royals. The center part of the postmark is the "day - month - year - hour" of the postmark. The top part of the postmark often says, "9494 Schaan." Schann is one of Liechtenstein's Municipality just north of Vaduz Castle. "9494" is the postcode for that post office.
The back of the envelope has the address of Castle Vaduz.
Mourning Envelope
The envelope has a black edge for mourning. And like their normal envelope features a stamp.
The postmark features Vaduz Castle, the Liechtenstein Royal's official residence.
