The "Dodo-Postcards" watermark is NOT on the actual card – it is an online watermark only.
Vienna. Interior View of the Opera House. Richard Pietsch. P. A. G
Vienna. Interior View of the Opera House with Iron Curtain. Richard Pietsch and Co
Vienna. View of the Interior of the Opera House. P. Ledermann. RP
Vienna. The Opera House. C. Bauer. Nr. 454
Vienna. The Opera House. Rau Color. Hans H. Rau. Multi View
Vienna. The Opera House. Hubmann. RP
Vienna. The Opera House. Hans H. Rau
Vienna. The Opera House. A. Kellner. 1969
