The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Unknown Castle with Lake. Postcard
Unknown castle with clock. Postcard. 1936
Windsor. Unknown Castle. Postcard
Unknown Place. Backerei. Large house with many windows. Postcard
Unknown Castle. Postcard. 1966
Unknown Castle. Postcard
Man and woman with hat at the unknown castle. Postcard. 1901