I had a couple of these made up when I restored my Oshawa 70 GTO Judge and there is a guy in Vernon with a 67 Beaumont SD396 that is asking me if they had this decal back then on the doors of the Beaumonts.
Pete 
 

Pretty sure the '70 model year GM cars were the first to get these!. ~

AUG- SEPT 1969

Not that i've seen on mine... only the tin GM emblem... ak

Thanks Everyone so 70 would of been the first year.. Being the first year they built the GTO in Canada. Maybe it was in relation to that as they sent most down to the States and they all have them down there but the wording is a bit different on them

Pete