it looks like the "then brand new" 105mm C2 howitzer, judging by the trucks it must have been taken before the arrival of the deuces. Some of the differances from the Canadian howitzer from the US was the muzzle swell, the coat of arms on the barrel and minor differances in the trails, stiffening , welding instead of rivits. also the inards of the recoil cylinders were different. they have now been upgraded to the C3
here is the DND site
http://www.army.forces.gc.ca/lf/Engl...=23&uSection=2
I knew a guy that worked the 155 as a young gunner, big heavy brutes they were a bitch to work on, although they worked well, they took to long to deploy and pack up, bad for business when counterbattery fire became quick and accurate.
The ones in the photo's do not have their spades attached to the trails, which were usually hung on the side of the trail.