Alberta highways road marker shield used in the 1960s.
<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=AB19600491">Photo</a>
<span class="int-own-work" lang="en">Own work</span>