<p>An undated postcard showing the "Detroit International Bridge" which I guess is what they once called the Ambassador Bridge (or the postcard is inaccurate). 
</p>
I like the old style Canadian flag in the postcard. I guess it's supposed to be the Canadian Red Ensign, but the coat of arms looks wrong.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/33988281@N00">Brandon Bartoszek</a> from Columbus, OH, USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/eridony/3866263294/">Detroit International Bridge</a>