The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Frederiksborg Slot. Rudolf Olsen. Nr. 1093. 1948
Frederiksborg Castle. Rudolf Olsen. Postcard
Frederiksborg Castle. Rudolf Olsen
Kobenhavn. Christiansborg Slot. Rudolf Olsen. Nr. 6172
Riddersalen. Frederiksborg Slot. J. Chr. Olsen. 1932
Kobenhavn. Gardere Foran Amalienborg Slot. Rudolf Olsen. Nr. 6860
Kobenhavn Rosenborg Slot. Rudolf Olsen. No. 6164
Kobenhavn. Rosenborg Slot. Rudolf Olsen. Nr. 249. 1948
