Don't think so ... my understanding is that they are marked as such
I'm probably wrong, but the guy who changed our locks said that Euro 3 type locks had keys like these ...It's just the star rating I can't identift. I know most now have star rating on outside face for all too see and identified its rating but this doesnt. Also told some Euro locks don't get marked
I'm told it is 3but just not convinced

Dunno TBH, but the key above is ours and the locksmith said they were Euro 3 ???But is "Euro 3" the same as "Euro 3 star"? Been out of the game for too long now...