The series has been based on watercolours by the painter Jacques Sonderer who has lived in Liechtenstein since 1983.
The "Autumn" stamp shows what is probably the most familiar view of this symbol of Liechtenstein: in its commanding position on the Castle Rock overlooking the capital and backed by a magnificent mountain panorama. The sumptuously grape-laden vines in the picture's foreground show the artist to have painted the Castle from within the Princely vineyard, known as the Herawingert or Bockwingert.
The "Winter" stamp presents a view of the mighty round tower on the Castle's north side within whose thick walls the Prince's celebrated art collection is housed. The picture also shows the striking Castle tower, one of the building's oldest parts (12th century).