Alberta highways road marker shield used in the 1930s.
<a href="//commons.wikimedia.org/w/index.php?title=User:MuzikMachine&amp;action=edit&amp;redlink=1" class="new" title="User:MuzikMachine (page does not exist)">MuzikMachine</a>
<a rel="nofollow" class="external text" href="https://www.aaroads.com/shields/show.php?image=AB19340281">Photo</a>, <a rel="nofollow" class="external text" href="http://www.routemarkers.com/canada/Alberta/1960s.gif">Photo</a>