Found footage originally shot probably by an American filmmaker while visiting New York.
The evidences I used to date it, thanks to viewers that commented, is the United Nation General Assembly building that you can watch at the beginning of the footage whose exterior was finished in 1950.
The absence (in the shots taken from the Empire State Building) of the Pan Am Building and all the glass skyscrapers built in the ’60s and the abscense of all glass boxes of Avenue of the Americas (Sixth Avenue), around Rockefeller Center and the Grand Central District, that begun to rises since late 1950s.
If you have more evidences to date it, please comment.
It contains stock footage of panoramas from the rooftop of Empire State Building, a ferry heading to Brooklyn terminal, the Statue of Liberty, the city skyline from the boat, transatlantic liners leaving the port and more.
The price to download the video without the watermark and use it in your production is 197 euro: