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On the sign:
1. Friedrich Schmidt Platz
Friedrich von Schmidt 1825-1891 Architekt, Dombaumeister, Erbauer des Rathauses
The sign is identical to (new) street signs in Vienna. And in it also appears at first the number of the district (District 1 - Innere Stadt) Click for sign's details
Below is another sign with an explanation of the name of the street - Friedrich von Schmidt, was the architect who designed the (new) city hall building which is located in this square.
Translation of the text on the sign: Frederick von Schmidt 1825-1891 Architect, master builder, builder of the town hall