British/Canadian Helmet insignia ID please

[skunkwerx]

I'd sure appreciate it if someone could ID these 2 unit badges in my collection.It's been stumping me for quite a while now.The one with the red & blue diamond(AA Art.) is a Canadian made C.L./C. 1942 but I can't figure out who the insignia on the diamond represents the other helmet is C.L//C. 1940 & has been period repainted & then had the decal added as shown.

[tinlid]

Hi, I've seen the artillery one before or very similar. But did'nt know what that was either There's a posibility that it could have been done post war, the other one with the red blue red flash is Royal army ordnance corps.
Aaron