A RCAF WWII double wing jacket patch for 135 Fighter Squadron operating initially out of Mossbank Saskatchewan followed by Patricia (Pat) Bay, British Columbia circa 1942-'44.  This Crest Craft back-stamp was first used in 1942-43.
<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.