(It seems to be approximately this view, if you compare the building on the far right of postcard and screen.)
С.-Петербургь НиколаевскнІ Мость
St. Pétersbourg Pont Nicolaus
Edition “Richard”, St.-Petersbourg. No. 41892
Nikolaevsky Bridge (Annunciation Bridge), St Petersburg.
Postmarked 1965 but St Petersburg was renamed Petrograd in 1914 and from Metro Postcard, publisher was in operation from 1903-1917