unfortunately, I cannot find any specific pictures of that badge, but you compare it to other ATC badges, and they have that more blue/gray background.
https://i.ebayimg.com/images/g/lxIAA...VC/s-l1600.jpg
And they still use that wreath style to this day. Where as Canada, the wreath around the crown never looked like that.
Your best bet is to talk to some of the ATC collectors and they will probably provide the best clarification on it.