My 3 Shark helmets only have ECE 2205 markings on them. All bought in Ontario from dealers.
And that's totally fine for use in Ontario (ECE 2205 is accepted), don't know about other provinces. It's also fine for US states where helmet use is not required, because obviously they don't care. It's theoretically not fine for US states that require helmet use ... they want DOT and don't care about anything else. BUT ... Having a helmet on your head regardless of compliance markings makes the probability of being pulled over extremely low. I've heard of cases in the USA where the cops are specifically pulling riders over to check for "novelty helmets" i.e. they are looking for DOT markings ... it is possible, and you could get caught up in that if it happens to you. A knowledgeable cop might know what ECE 2205 means and spot your out-of-country license plate ... but I wouldn't count on it. "IF helmet doesn't have a DOT marking THEN write ticket" is a lot more likely ...