Looking at the Arc de Triomphe, c1965

This photo shows a street in Paris from about 1965 with the Arc de Triomphe in the distance. There is a ghostly image which can be seen across the image which suggests this photo was perhaps taken through a window and there are reflections showing. The other possibility is that this photo was double exposed.

There are many flags showing down the tree lined street - I don't know if this is a standard feature of the streets leading up to the monument, or if it was a feature at the time the photo was shot.