Hi Bruce;
The "47", along with the Cdn I Corps formation sign would be correct. Upon the reorganization of the 5th Cdn Armd Div (beginning in Jan 1943), the RCD became "Corps Troops", but at that point, there was no establishment for a "Corps Armoured Car Regiment", so the RCD retained their "47" serial, until such time as the new establishment for a "Corps Armoured Car Regiment", was issued, which was sometime before the summer of 1943, just haven't found the exact date yet. (Note: also at the same time of the reorganization of 5th Cdn Armd Div, the new serials for the AoS markings of the new Armoured Division establishment would have come into effect, making the "47" serial of the RCD, more or less, surplus to requirements)
Hope this helps.
Cheers
