A RCAF patch from Cold Lake Alberta, #3 Operational Training Unit (OTU), Repair group circa 1955-'57. The Back-stamp indicates the Crest was made by Crest Craft of Saskatoon after 1951.
<a href="//commons.wikimedia.org/wiki/User:A_much_better_place" title="User:A much better place">A much better place, Wayne Logus</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span> scan of patch. Originally designed by Gustav Werle, founder of Crest Craft Ltd. of Saskatoon, SK.